Major interaction on record — check this product against your medications before combining. Based on 5 of 8 ingredients. Check your meds →
Dietary supplement

Redline White Heat Watermelon Ingredients & Drug Interactions

by VPX

Redline White Heat Watermelon label
See full label image
Powder Category: Other Combinations
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Redline White Heat Watermelon against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Major

Redline White Heat Watermelon is a dietary supplement by VPX with 8 active ingredients. Its ingredients are commonly taken for mental alertness and reducing fatigue, improving athletic performance, headache and migraine relief.Based on those ingredients, 1,388 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Yohimbe, Evodia, Caffeine Anhydrous. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

Jump to a section

Check Your Meds Against Redline White Heat Watermelon by VPX

Ask about any prescription or over-the-counter medication and we check it for interactions with Redline White Heat Watermelon by VPX — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Redline White Heat Watermelon by VPX

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 11, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 1 of its 8 active ingredients.
  • “Proprietary Blend” is a proprietary blend — the label gives one combined amount (2,626 mg) without saying how much of each component you get.

This pre-workout powder contains eight ingredients, including four active compounds with established or emerging roles. Caffeine anhydrous is a stimulant that promotes mental alertness and athletic performance.

Theacrine is a related alkaloid whose effects in humans haven't been well established in research. Yohimbe bark extract contains yohimbine, traditionally used for energy and circulation, though evidence for its effectiveness is limited.

Citicoline sodium supports brain function and has possibly effective evidence for age-related cognitive decline and glaucoma. The product also includes Cluster Dextrin (a carbohydrate source we couldn't check), 4-Amino-2-Methylpentane Citrate (unchecked), Evodia extract, and Hydroxypropyl Distarch Phosphate.

Inactive ingredients include malic acid, natural and artificial flavors, citric acid, and sucralose (a sweetener).

Does it work?

Strong evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Strong

Clinical evidence supports at least one of this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Ultimate pre-workout performance and athletic enhancement.
  • We looked for evidence on: Athletic performance, Mental alertness, Fatigue, Muscle strength, Exercise-induced muscle soreness, Workout endurance — and 3 related terms.
  • The strongest evidence on file: Caffeine is rated "Likely Effective" for Athletic performance (Natural Medicines).
  • Also on file: Caffeine is rated "Likely Effective" for Mental alertness.
  • Also on file: Yohimbe is rated "Insufficient Reliable Evidence To Rate" for Athletic performance, Fatigue.

Caffeine is established as effective for neonatal apnea and postoperative headache, and likely effective for mental alertness and athletic performance. Theacrine's effectiveness isn't established in our data—studies haven't reliably shown it works for athletic performance, cognitive function, fatigue, mental alertness, or muscle strength.

Citicoline has possibly effective evidence for age-related cognitive decline and glaucoma, but possibly ineffective evidence for stroke. Yohimbe's evidence is insufficient to rate for obesity, blood pressure issues, or sexual dysfunction.

Evodia has no effectiveness ratings in our data.

The evidence, ingredient by ingredient Caffeine Theacrine Evodia Yohimbe Citicoline

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 4 of the 5 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 4 of 5.
  • General safety write-ups exist for 5 of 5.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Caffeine in moderate amounts is generally well tolerated in healthy adults, though high doses can cause serious side effects. Common side effects include anxiety, jitteriness, dependence with regular use, diarrhea, gastric upset, headache, insomnia, tremors, nausea, and restlessness.

Rarely, stroke has been reported. Yohimbe carries significant caution due to unpredictable potency and potential heart and blood pressure effects; common side effects include anxiety, agitation, sweating, diarrhea, flushing, headache, high blood pressure, increased urination, nausea, rapid heartbeat, tremors, dizziness, and vomiting.

A hypertensive crisis has been reported. Theacrine's long-term safety isn't well established.

Citicoline is generally well tolerated; possible side effects include abdominal pain, back pain, blurred vision, constipation, diarrhea, swelling, headache, insomnia, nausea, and rash. Evodia has limited human safety data; animal studies show it can cause heart rhythm problems.

Side effects, ingredient by ingredient Caffeine Theacrine Evodia Yohimbe Citicoline

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 4 of the 5 matched ingredients can interact with medications — Yohimbe, Caffeine, Evodia, Theacrine.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs; diabetes medications; heart-rhythm medications; lithium.
  • For scale: 1,389 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check for monoamine oxidase inhibitors (MAOIs) — yohimbe can cause serious reactions with these older antidepressants. Also double-check: ephedrine (Major risk), barbiturates, heart medications (dipyridamole, those affecting QT interval), antipsychotics, tricyclic antidepressants, blood pressure medications, blood thinners (anticoagulants) and antiplatelet drugs, seizure medications, theophylline, quinolone antibiotics, cimetidine, and any drug metabolized by CYP1A2, CYP2D6, CYP3A4, or CYP2E1 liver enzymes.

If you're unsure whether your medications are affected, search them on this page.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

This is a stimulant-heavy pre-workout formula best suited for healthy adults without heart conditions, high blood pressure, anxiety disorders, or sleep issues. If you take any medications—especially antidepressants, blood pressure drugs, blood thinners, seizure medications, or heart drugs—you need to check them against our interaction tool before using this product.

Talk to your pharmacist or doctor first if you have any chronic health conditions or take regular medications.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 5 of 8 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Oct 22, 2015.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Redline White Heat Watermelon, straight from the product label.

Brand VPX
Barcode (UPC) 610764180575
Net contents 5.64 oz.; 160 Gram(s)
Market status On market
Date entered into DSLD Oct 22, 2015
DSLD ID 51721
Product type Other Combinations
Supplement form Powder
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Gluten Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Redline White Heat Watermelon by VPX, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
2 Gram(s)
Maximum serving Sizes:
4 Gram(s)
Servings per container
40
UPC/BARCODE
610764180575
IngredientAmount% DV
Calories10 {Calories}--
Total Carbohydrates2 Gram(s)1%
Cluster Dextrin0 NP--
Proprietary Blend2626 mg--
Caffeine Anhydrous400 mg--
4-Amino-2-Methylpentane Citrate0 NP--
Theacrine0 NP--
Hydroxypropyl Distarch Phosphate0 NP--
Evodia0 NP--
Yohimbe0 NP--
Citicoline Sodium0 NP--

Other ingredients: Malic Acid, Natural and Artificial flavors, Citric Acid Anhydrous, Sucralean brand Sucralose

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements

Ultimate Pre-Workout Powerhouse

Made in USA from domestic & Imported Ingredients in VPX State of the Art GMP Facilities.

Natural & Artificial Flavors

Product contains heat and moisture sensitive materials which can cause clumping and settling. Shake well before opening.

Not a significant source of vitamin A, vitamin C, calcium or iron.

Precautions

Warning: Not for use by individuals under the age of 18 years.

Do not use if pregnant or nursing. Consult a physician or licensed qualified health care professional before using this product if you have, or have a family history of heart disease, thyroid disease, diabetes, high blood pressure, depression or other psychiatric condition, glaucoma, difficulty in urinating, prostate enlargement, or seizure disorder, or if you are using a monoamine oxidase inhibitor (MAOI) or any other dietary supplement, prescription drug, or over-the-counter drug containing ephedrine, pseudoephedrine, or phenylpropanolamine (ingredients found in certain allergy, asthma, cough or cold, and weight control products).

Do not exceed recommended serving. Exceeding recommended serving may cause adverse health effects. Discontinue use and call a physician or licensed qualified health care professional immediately if you experience rapid heartbeet, dizziness, severe headache, shortness of breath or other similar symptoms. Individuals who are sensitive to the effects of caffeine or have a medical condition should consult a licensed health care professional before consuming this product. Do not use this product if you are more that 15 pounds overweight. The consumer assumes total liability if this product us used in a manner inconsistent with label guidelines. Do not use for weight reduction. This product is intended for use by healthy individuals only.

Do not use this product if you are pregnant or nursing or have any medical condition.

Keep out of reach of children.

Too much caffeine may cause nervousness, irritability, sleeplessness and occasionally rapid heartbeat.

Not recommended for use by children under 18 years of age.

Allergen Warning: Manufactured in a facility that processes milk, eggs, shellfish, tree nuts, peanuts, wheat and soy.

Do not purchase if safety seal is broken or missing.

Formula

One serving or Redline White Heat provides 400 mg of caffeine which is more than three cups of coffee.

FDA Disclaimer Statement

These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.

FDA Statement of Identity

Dietary Supplement

Seals/Symbols

VPX LIVE POWERFULLY

VITAL PHARMACEUTICALS GMP

GLUTEN FREE GF

{NON} GMO

Brand IP Statement(s)

Ultimate Energy Rush

2014 Vital Pharmaceuticals, Inc. All Rights Reserved.

Suggested/Recommended/Usage/Directions

Directions: Mix 1 scoop of Redline White Heat with 8-10 oz of water. Start with 1/2 scoop to assess tolerance.

Storage

Store container between 15(0)C to 25(0)C (59(0)F to 77(0)F).

General

V004

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Redline White Heat Watermelon by VPX label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Redline White Heat Watermelon label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Redline White Heat Watermelon by VPX

These are the 8 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Gram(s) Dosage formPowder Servings per container40 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Proprietary Blend

2626 mg per serving

Other (inactive) ingredients: Malic Acid, Natural and Artificial flavors, Citric Acid Anhydrous, Sucralean brand Sucralose. These complete the product’s ingredient list but are not active constituents.

Interaction report

Redline White Heat Watermelon by VPX Drug Interactions

Want to check YOUR meds against Redline White Heat Watermelon?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
1,388Drugs
17 Major 1,295 Moderate 76 Minor

Ingredients driving the most interactions

Yohimbe 1,125
Evodia 950
Caffeine Anhydrous 655
Theacrine 248

Individual Drug Interactions

The ingredients in Redline White Heat Watermelon interact with 1,388 drugs. Click any drug to see the details.

4 of the 8 ingredients in Redline White Heat Watermelon interact with drugs. Each result below shows which ingredient is responsible. Yohimbe Evodia Caffeine Anhydrous Theacrine

Each ingredient & the kinds of drugs it affects

For each ingredient in Redline White Heat Watermelon with known interactions, here are the types of medications they can affect. Open any type for the detail — or search your exact drug in the checker above.

Yohimbe13 drug types · 1,125 drugs

Monoamine Oxidase Inhibitors (Maois)

Concomitant use of MAOIs with yohimbe can result in additive effects.
Yohimbine, a constituent of yohimbe, has MAO inhibitory effects. At high doses, yohimbine is a non-selective inhibitor of MAO.

Likelihood Likely Evidence D
Antihypertensive Drugs

Theoretically, yohimbe might reduce the effects of antihypertensive drugs.
Yohimbine, a constituent of yohimbe, is an alpha-2 adrenoceptor antagonist and has been reported to increase blood pressure in clinical research. Theoretically, concomitant use of yohimbe and antihypertensive drugs can interfere with blood pressure control.

Likelihood Probable Evidence D
Clonidine (Catapres)

Theoretically, yohimbe might precipitate clonidine withdrawal.
Chronic clonidine use can downregulate alpha-2 adrenoreceptors. Animal research and one human case report suggest that concomitant administration of yohimbine, an alpha-2 adrenoceptor antagonist, may precipitate clonidine withdrawal and lead to sympathomimetic toxicity, including hypertensive crisis.

Likelihood Possible Evidence D
Cytochrome P450 2D6 (Cyp2D6) Inhibitors

CYP2D6 inhibitors may increase the levels and adverse effects of yohimbine, a constituent of yohimbe.
In vitro and clinical research shows that the yohimbe bark constituent, yohimbine, is metabolized by CYP2D6 isoenzymes. Paroxetine, a cytochrome P450 (CYP) 2D6 inhibitor, increases the maximum serum concentration of yohimbine and reduces the clearance of yohimbine compared to yohimbine alone in patients who are extensive CYP2D6 metabolizers..

Likelihood Probable Evidence B
Cytochrome P450 2D6 (Cyp2D6) Substrates

Theoretically, yohimbe might increase the levels and adverse effects of CYP2D6 substrates.
In vitro research suggests that yohimbine, a constituent of yohimbe bark, inhibits CYP2D6 enzyme activity.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Inhibitors

Theoretically, CYP3A4 inhibitors might increase the levels and adverse effects of yohimbine, a constituent of yohimbe bark.
In vitro and clinical research shows that the yohimbe bark constituent, yohimbine, is metabolized by CYP3A4 enzymes. Theoretically, drugs that inhibit CYP3A4 might increase the levels and adverse effects of yohimbine.

Likelihood Possible Evidence D
Paroxetine (Paxil)

Paroxetine decreases the clearance of yohimbine and may increase its effects.
Paroxetine, a cytochrome P450 (CYP) 2D6 inhibitor, increases the maximum serum concentration of yohimbine by about 350% and reduces the clearance of yohimbine by about 80% compared to yohimbine alone in patients who are extensive CYP2D6 metabolizers. No significant changes in pharmacokinetic parameters of yohimbine were observed with coadministration of paroxetine in patients who are poor CYP2D6 metabolizers.

Likelihood Probable Evidence B
Phenothiazines

Theoretically, using yohimbine with phenothiazines might have additive effects.
Yohimbine, a constituent of yohimbe, has alpha-2 adrenergic antagonist effects. Theoretically, combining it with phenothiazines can cause additive alpha-2 adrenergic antagonism.

Likelihood Possible Evidence D
Stimulant Drugs

Theoretically, taking yohimbe with stimulant drugs can have additive effects.
Yohimbine, a constituent of yohimbe, has sympathomimetic effects and increases blood pressure in a dose-dependent manner. Theoretically, taking yohimbe with stimulant drugs can have additive stimulant and hypertensive effects.

Likelihood Possible Evidence D
Tricyclic Antidepressants (Tcas)

Theoretically, taking yohimbe with TCAs can increase adverse effects.
A small clinical study in patients taking TCAs for at least 4 weeks shows that receiving doses of intravenous yohimbine 2.5-20 mg daily for up to 7 days precipitates severe anxiety, agitation, and tremor. The effects of yohimbe bark itself are unclear; oral yohimbe bark contains 0.6% to 1.38% yohimbine, but it is unclear how much is absorbed.

Likelihood Possible Evidence D
Anticoagulant/Antiplatelet Drugs

Theoretically, combining yohimbe bark with antiplatelet or anticoagulant drugs might have additive effects; however, this has not been reported in clinical research.
Research in healthy adults shows that taking yohimbine, a constituent of yohimbe bark, in doses of 8 mg or more, seems to inhibit platelet aggregation in vitro by binding to the alpha-2 adrenoceptor. The effects of yohimbe bark itself are unclear; yohimbe bark contains 0.6% to 1.38% yohimbine, but it is unclear how much is absorbed.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Theoretically, yohimbe might decrease the levels and clinical effects of CYP1A2 substrates.
In vitro research shows that yohimbe extract induces CYP1A2 enzymes.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, yohimbe might decrease the levels and clinical effects of CYP3A4 substrates.
In vitro research shows that yohimbe extract induces CYP3A4 enzymes.

Likelihood Possible Evidence D
Yohimbe full monograph & interactions

Evodia11 drug types · 950 drugs

Anticoagulant/Antiplatelet Drugs

Theoretically, taking evodia with antiplatelet or anticoagulant drugs might increase the risk of bruising and bleeding.
In vitro and animal studies show that rutaecarpine, a constituent of evodia, inhibits platelet aggregation.

Likelihood Possible Evidence D
Caffeine

Theoretically, evodia might decrease the levels and clinical effects of caffeine.
In animal models, evodia extract decreases caffeine levels by up to 71%. Evodia extract induces hepatic cytochrome P450 1A2 (CYP1A2) enzyme, of which caffeine is a substrate.

Likelihood Probable Evidence D
Chlorzoxazone (Parafon Forte, Paraflex)

Theoretically, evodia might decrease the levels and clinical effects of chlorzoxazone.
Animal research shows that administration of rutaecarpine, a constituent of evodia, with chlorzoxazone reduces the area under the curve (AUC) of chlorzoxazone by 84% and increases its clearance by 646%. This interaction is likely due to induction of cytochrome P450 2E1 (CYP2E1) by rutaecarpine .

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Inhibitors

Theoretically, drugs that inhibit CYP1A2 might increase the levels and clinical effects of evodia.
The evodia constituent rutaecarpine is metabolized by CYP1A2.

Likelihood Possible Evidence D
Cytochrome P450 1A2 (Cyp1A2) Substrates

Evodia might reduce the levels and clinical effects of CYP1A2 substrates through induction of CYP1A2.
Evodia extract and the evodia constituent rutaecarpine induce hepatic CYP1A2 enzyme activity. Evodia decreases levels of theophylline and caffeine, CYP1A2 substrates, by about 70% in animal models.

Likelihood Probable Evidence D
Cytochrome P450 2E1 (Cyp2E1) Substrates

Theoretically, evodia might reduce the levels and clinical effects of CYP2E1 substrates through induction of CYP2E1.
Animal research suggests that rutaecarpine, a constituent of evodia, induces CYP2E1 activity. In rats, rutaecarpine increases markers of CYP2E1 activity, and administration of rutaecarpine with chlorzoxazone, a known CYP2E1 substrate, reduces the area under the curve (AUC) of chlorzoxazone by 84% and increases its clearance by 646%.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Inducers

Theoretically, taking CYP3A4 inducers might decrease the levels and clinical effects of evodia.
Animal research shows that concomitant administration of dexamethasone, a known CYP3A4 inducer, with the alkaloid constituents of evodia significantly reduces the area under the curve (AUC), maximum concentration (Cmax), and half-life of these constituents.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Inhibitors

Theoretically, CYP3A4 inhibitors might increase the levels and clinical effects of evodia.
Animal research shows that concomitant administration of ketoconazole, a known CYP3A4 inhibitor, with the alkaloid constituents of evodia significantly increases the area under the curve (AUC), maximum concentration (Cmax), and half-life of these constituents.

Likelihood Possible Evidence D
Cytochrome P450 3A4 (Cyp3A4) Substrates

Theoretically, evodia might increase the levels and clinical effects of CYP3A4 substrates.
In vitro research shows that evodia extract inhibits hepatic CYP3A4. This effect has not been reported in humans.

Likelihood Possible Evidence D
Qt Interval-Prolonging Drugs

Theoretically, evodia might have an additive effect with drugs that prolong the QT interval, potentially increasing the risk of ventricular arrhythmias.
Evodia has demonstrated dose-dependent activity as a proarrhythmic agent in animal and in vitro studies. Evodia infusion in animals extends the action duration potential and induces prolongation of the QT interval and Torsade de pointes.

Likelihood Possible Evidence D
Theophylline

Theoretically, evodia might decrease the levels and clinical effects of theophylline.
The evodia constituent rutaecarpine decreases theophylline levels and half-life by about 70% in animal models. This constituent appears to induce hepatic cytochrome P450 1A2 (CYP1A2) enzyme activity, of which theophylline is a substrate. Rutaecarpine is the primary active constituent of evodia; however, it is not known if the whole crude extract of evodia also causes this interaction.

Likelihood Probable Evidence D
Evodia full monograph & interactions

Caffeine Anhydrous41 drug types · 655 drugs

Ephedrine

Theoretically, concomitant use might increase the risk for stimulant adverse effects.
Use of ephedrine with caffeine can increase the risk of stimulatory adverse effects. There is evidence that using ephedrine with caffeine might increase the risk of serious life-threatening or debilitating adverse effects such as hypertension, myocardial infarction, stroke, seizures, and death.

Likelihood Probable Evidence D
Adenosine (Adenocard)

Theoretically, caffeine might decrease the vasodilatory effects of adenosine and interfere with its use prior to stress testing.
Some evidence shows that caffeine is a competitive inhibitor of adenosine and can reduce the vasodilatory effects of adenosine in humans. However, other research shows that caffeine does not seem to affect supplemental adenosine because high interstitial levels of adenosine overcome the antagonistic effects of caffeine. It is recommended that methylxanthines and methylxanthine-containing products be stopped 24 hours prior to pharmacological stress tests. However, methylxanthines appear more likely to interfere with dipyridamole (Persantine) than adenosine-induced stress testing.

Likelihood Possible Evidence B
Anticoagulant/Antiplatelet Drugs

Theoretically, caffeine may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Caffeine is reported to have antiplatelet activity. Theoretically, it might increase the risk of bleeding when used concomitantly with these agents; however, this interaction has not been reported in humans.

Likelihood Possible Evidence D
Beta-Adrenergic Agonists

Theoretically, large amounts of caffeine might increase the cardiac inotropic effects of beta-agonists.

Likelihood Probable Evidence D
Carbamazepine (Tegretol)

Theoretically, caffeine might reduce the effects of carbamazepine and increase the risk for convulsions.
Animal research suggests that taking caffeine can lower the anticonvulsant effects of carbamazepine and can induce seizures when taken in doses above 400 mg/kg. Human research has shown that taking caffeine 300 mg in three divided doses along with carbamazepine 200 mg reduces the bioavailability of carbamazepine by 32% and prolongs the plasma half-life of carbamazepine 2-fold in healthy individuals.

Likelihood Possible Evidence D
Cimetidine (Tagamet)

Theoretically, cimetidine might increase the levels and adverse effects of caffeine.
Cimetidine decreases the rate of caffeine clearance by 31% to 42%.

Likelihood Likely Evidence B
Clozapine (Clozaril)

Caffeine might increase the levels and adverse effects of clozapine and acutely exacerbate psychotic symptoms.
Caffeine might increase the effects and toxicity of clozapine. Caffeine doses of 400-1000 mg per day inhibit clozapine metabolism. Clozapine is metabolized by cytochrome P450 1A2 (CYP1A2). Although researchers speculate that caffeine might inhibit CYP1A2, there is no reliable evidence that caffeine affects CYP1A2. There is also speculation that genetic factors might make some patients more sensitive to an interaction between clozapine and caffeine. In one case report, severe, life-threatening clozapine toxicity and multiorgan system failure occurred in a patient with schizophrenia stabilized on clozapine who consumed caffeine 600 mg daily.

Likelihood Possible Evidence B
Dipyridamole (Persantine)

Theoretically, caffeine might decrease the vasodilatory effects of dipyridamole and interfere with its use prior to stress testing.
Caffeine inhibits dipyridamole-induced vasodilation. It is recommended that methylxanthines and methylxanthine-containing products be stopped 24 hours prior to pharmacological stress tests. Methylxanthines appear more likely to interfere with dipyridamole (Persantine) than adenosine-induced stress testing.

Likelihood Probable Evidence B
Disulfiram (Antabuse)

Theoretically, disulfiram use might increase the levels and adverse effects of caffeine.
Disulfiram decreases the rate of caffeine clearance.

Likelihood Probable Evidence B
Diuretic Drugs

Theoretically, using caffeine with diuretic drugs might increase the risk of hypokalemia.
Caffeine, especially in excessive amounts, can reduce potassium levels due to stimulation of the sodium-potassium pump. Diuretics can also cause lower potassium levels.

Likelihood Possible Evidence D
Estrogens

Theoretically, estrogens might increase the levels and adverse effects of caffeine.
Estrogen inhibits caffeine metabolism.

Likelihood Probable Evidence B
Ethosuximide (Zarontin)

Theoretically, caffeine might reduce the effects of ethosuximide and increase the risk for convulsions.
Animal research suggests that caffeine 92.4 mg/kg can decrease the anticonvulsant activity of ethosuximide. However, this effect has not been reported in humans.

Likelihood Possible Evidence D
Felbamate (Felbatol)

Theoretically, caffeine might reduce the effects of felbamate and increase the risk for convulsions.
Animal research suggests that a high dose of caffeine 161.7 mg/kg can decreases the anticonvulsant activity of felbamate. However, this effect has not been reported in humans.

Likelihood Possible Evidence D
Flutamide (Eulexin)

Theoretically, caffeine might increase the levels and adverse effects of flutamide.
In vitro evidence suggests that caffeine can inhibit the metabolism of flutamide. However, this effect has not been reported in humans.

Likelihood Probable Evidence D
Fluvoxamine (Luvox)

Theoretically, fluvoxamine might increase the levels and adverse effects of caffeine.
Fluvoxamine reduces caffeine metabolism.

Likelihood Probable Evidence D
Lithium

Abrupt caffeine withdrawal might increase the levels and adverse effects of lithium.
Caffeine has diuretic activity. When abruptly discontinued, caffeine may alter the clearance of lithium. There are two case reports of lithium tremor that worsened upon abrupt coffee withdrawal and 6 case reports of elevated serum lithium levels after reducing or eliminating caffeine intake. In one case, a male with schizoaffective disorder stabilized on lithium had an elevated lithium level after reducing his caffeine intake by 87%. At a later date, he increased his caffeine intake by 6-fold, resulting in a subtherapeutic lithium level and a recurrence of psychiatric symptoms.

Likelihood Probable Evidence D
Monoamine Oxidase Inhibitors (Maois)

Theoretically, concomitant use might increase the risk of a hypertensive crisis.
Caffeine has been shown to inhibit monoamine oxidase (MAO) A and B in laboratory studies. Concomitant intake of large amounts of caffeine with MAOIs might precipitate a hypertensive crisis. In a case report, a patient that consumed 10-12 cups of caffeinated coffee and took the MAOI tranylcypromine presented with severe hypertension. Hypertension was resolved after the patient switched to drinking decaffeinated coffee.

Likelihood Possible Evidence D
Nicotine

Theoretically, concomitant use might increase the risk of hypertension.
Concomitant use of caffeine and nicotine has been shown to have additive cardiovascular effects, including increased heart rate and blood pressure. Blood pressure was increased by 10.8/12.4 mmHg when the agents were used concomitantly.

Likelihood Probable Evidence B
Pentobarbital (Nembutal)

Theoretically, caffeine might decrease the effects of pentobarbital.
Caffeine might negate the hypnotic effects of pentobarbital.

Likelihood Possible Evidence B
Phenobarbital (Luminal)

Theoretically, caffeine might reduce the effects of phenobarbital and increase the risk for convulsions.
Animal research suggests that caffeine can decrease the anticonvulsant activity of phenobarbital. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Phenylpropanolamine

Theoretically, phenylpropanolamine might increase the risk of hypertension, as well as the levels and adverse effects of caffeine.
Concomitant use of phenylpropanolamine and caffeine might cause an additive increase in blood pressure. Phenylpropanolamine also seems to increase caffeine serum levels.

Likelihood Probable Evidence B
Phenytoin (Dilantin)

Theoretically, caffeine might reduce the effects of phenytoin and increase the risk for convulsions.
Animal research suggests that caffeine can decrease the anticonvulsant activity of phenytoin. The effect does not seem to be related to the seizure threshold-lowering effects of caffeine. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Pioglitazone (Actos)

Theoretically, caffeine might increase the levels and clinical effects of pioglitazone.
Animal research suggests that caffeine can modestly increase the maximum concentration, area under the curve, and half-life of pioglitazone, and also reduce its clearance. This increased the antidiabetic effects of pioglitazone. However, the exact mechanism of this interaction is unclear.

Likelihood Possible Evidence D
Quinolone Antibiotics

Theoretically, quinolone antibiotics might increase the levels and adverse effects of caffeine.
Quinolones (also called fluoroquinolones) can decrease caffeine clearance by inhibiting cytochrome P450 1A2 (CYP1A2) enzyme.

Likelihood Probable Evidence B
Riluzole (Rilutek)

Theoretically, concomitant use might increase the levels and adverse effects of both caffeine and riluzole.
Caffeine and riluzole are both metabolized by cytochrome P450 1A2 (CYP1A2), and concomitant use might reduce the metabolism of one or both agents.

Likelihood Possible Evidence D
Caffeine Anhydrous full monograph & all 41 interactions

Theacrine1 drug type · 248 drugs

Cns Depressants

Theoretically, theacrine might alter the effects of CNS depressants.
Animal research shows that low doses of theacrine have sedating effects, whereas high doses might have stimulant effects. Depending on the dose of theacrine used, it might increase or decrease the effects of CNS depressants. However, these effects have not yet been reported in humans.

Likelihood Possible Evidence D
Theacrine full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Redline White Heat Watermelon, from the product label.

VPX

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Web Address
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Pharmacist Counseling Corner

Redline White Heat Watermelon by VPX: Common Questions

Does Redline White Heat Watermelon by VPX interact with any medications?
Yes. Based on its ingredients, Redline White Heat Watermelon has a known interaction with 1,388 medications, including 17 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Redline White Heat Watermelon contains 8 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Is it safe to take this while pregnant?
There isn't enough safety data for most of these ingredients in pregnancy. Caffeine is rated possibly safe and possibly unsafe—mixed data exist—so talk with your doctor about safe limits. Theacrine, evodia, and yohimbe are all rated unsafe or possibly unsafe in pregnancy and should be avoided. Citicoline has insufficient data. You'll need to discuss this product with your doctor or pharmacist for personalized advice.
Can I take this while breastfeeding?
Safety data is insufficient or advises against it for most ingredients. Caffeine in small amounts passes into breast milk and is usually considered acceptable with moderate intake, but it can affect the baby. Theacrine, evodia, yohimbe, and citicoline all have insufficient safety information or should be avoided while breastfeeding. Talk with your pharmacist or doctor before using this product.
Will this really boost my athletic performance?
Caffeine is likely effective for athletic performance based on research evidence. Theacrine hasn't been reliably shown to work for athletic performance in our data, so we don't know if it contributes to that claim. The other active ingredients don't have established effectiveness for exercise or sports performance.
What's yohimbe for?
Yohimbe bark contains yohimbine and is traditionally used for energy and circulation. However, evidence for its effectiveness is insufficient—we don't have reliable data showing it works for obesity, blood pressure issues, or other claimed uses. It does carry real risks for heart and blood pressure side effects, especially at higher doses.
What are the main side effects I should expect?
Caffeine commonly causes jitteriness, anxiety, insomnia, headache, nausea, and tremors. Yohimbe can cause anxiety, agitation, sweating, high blood pressure, rapid heartbeat, dizziness, and nausea—with potentially serious heart effects at higher doses. Both ingredients together increase stimulant effects and may worsen these reactions.
Why do I need to check this with my medications?
This product has ingredients that interact with over 1,300 individual medications through multiple pathways—caffeine and evodia affect liver enzymes that break down many drugs, yohimbe affects blood pressure and can combine dangerously with antidepressants, and theacrine can alter sedatives. Even common medications can be affected, which is why a personalized check is essential.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Redline White Heat Watermelon label
Go deeper

The Full Monographs Behind Redline White Heat Watermelon’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Caffeine

Interacts with 655 drugs

Caffeine is a natural stimulant found in coffee, tea, and many other plants and products. In moderate amounts it can boost alertness and reduce tiredness for most healthy adults, but too muc...

Read the full Caffeine monograph → Herb & supplement monograph

Theacrine

Interacts with 248 drugs

Theacrine is a caffeine-like compound found naturally in certain tea plants and is sold in supplements for energy, focus, and mood. Early human studies suggest it may give a stimulant-like b...

Read the full Theacrine monograph → Herb & supplement monograph

Evodia

Interacts with 950 drugs

Evodia is a fruit used in traditional Chinese medicine, most often for digestive complaints, headaches, and menstrual pain. Human evidence for these uses is very limited, and it is mostly st...

Read the full Evodia monograph → Herb & supplement monograph

Yohimbe

Interacts with 1,125 drugs

Yohimbe is a West African tree bark that contains yohimbine, a compound mainly promoted for erectile dysfunction and as an aphrodisiac. A prescription form of yohimbine has some evidence for...

Read the full Yohimbe monograph → Herb & supplement monograph

Citicoline

Citicoline is a naturally occurring compound involved in making brain cell membranes and the messenger chemical acetylcholine. It is popularly taken for memory, focus, and brain aging, and s...

Read the full Citicoline monograph →
Sources

Sources & How We Checked

Redline White Heat Watermelon's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 327 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Caffeine 236 references
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Yohimbe 66 references
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