NAC 600 mg Ingredients & Drug Interactions
by NOW
What is this page for?
First and foremost: checking NAC 600 mg 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
NAC 600 mg is a dietary supplement by NOW with 2 active ingredients. Its ingredients are commonly taken for thyroid health support, antioxidant support, immune support.Based on those ingredients, 493 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Selenium, NAC. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against NAC 600 mg by NOW
Ask about any prescription or over-the-counter medication and we check it for interactions with NAC 600 mg by NOW — and tell you which ingredient is responsible.
AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of NAC 600 mg by NOW
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.
What’s inside
Full disclosure
This product contains two active ingredients: NAC (N-acetyl cysteine) at 600 mg per capsule, and Selenium (which is listed as a blend — its exact form isn't specified here). The capsule also contains inactive ingredients including hypromellose, stearic acid, citric acid, and microcrystalline cellulose, which are fillers and binders.
Does it work?
Strong evidence
NAC is effective for acetaminophen (Tylenol) poisoning, a lung condition called atelectasis, certain bronchial diagnostic procedures, and tracheostomy care. It's possibly effective for bronchitis.
The effectiveness data we hold doesn't cover other uses you may have heard about, so if you're considering this for something else, check with your pharmacist or doctor about the evidence.
How safe is it?
Well-documented data
NAC is generally well tolerated at typical doses like this one (600 mg). The most common side effects from oral NAC are nausea, vomiting, diarrhea, dry mouth, heartburn, and loss of appetite — most of these happen at much higher doses (above 9 grams per single dose or more than 30 grams daily).
Some people in trials reported joint pain. There isn't enough reliable safety data during pregnancy, so talk with your doctor if you're pregnant or planning to become pregnant.
Safety information for L-selenomethionine during pregnancy or breastfeeding isn't on file here.
Meds to double-check
Major interaction found
Before taking this, double-check with your pharmacist if you're on nitroglycerin (Major concern — risk of severe low blood pressure and headaches), blood thinners or antiplatelet drugs like warfarin or aspirin (Moderate — increased bleeding risk), blood pressure medications (Moderate — may lower pressure further), chloroquine for malaria (Moderate — may weaken it), or activated charcoal (Moderate — they interfere with each other).
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.
This product is worth considering if you're taking it for acetaminophen poisoning, atelectasis, or tracheostomy care — NAC is proven effective for those. If you take nitroglycerin, blood thinners, blood pressure medications, or antimalarial drugs, you'll need to talk with your pharmacist before starting.
Generally well tolerated at this dose, but run your medications through the checker first.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated May 23, 2024.
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
General information
Key facts about NAC 600 mg, straight from the product label.
| Brand | NOW |
|---|---|
| Barcode (UPC) | 733739000859 |
| Net contents | 100 Capsule(s) |
| Market status | On market |
| Date entered into DSLD | May 23, 2024 |
| DSLD ID | 313863 |
| Product type | Other Combinations |
| Supplement form | Capsule |
| Dietary claims / uses | Nutrient, All Other, Structure/Function |
| Intended target group(s) | Adult (18 - 50 Years), Kosher, Halal, Gluten Free, Dairy Free |
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 NAC 600 mg by NOW, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Selenium | 25 mcg | 45% |
| NAC | 600 mg | -- |
| L-Selenomethionine | 5 mg | -- |
Other ingredients: Hypromellose, Stearic Acid, Citric Acid, Microcrystalline Cellulose
Tap any ingredient to jump to its full detail below.
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.
Suggested/Recommended/Usage/Directions
Suggested Usage: Take 1 capsule twice daily.
Formula
N-acetyl cysteine (NAC) is a stable form of the non-essential amino acid cysteine. It is a sulfur-containing amino acid that acts as a stabilizer for the formation of protein structures, and is also necessary for the formation of glutathione. Selenium is an essential trace mineral that facilitates the production of several important enzymes.
NAC 600 mg with Selenium
Triangle K (Kosher)
Crescent H (Halal)
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Precautions
Caution: For adults only. Keep out of reach of children.
Consult physician if pregnant/nursing, taking medication, or have a medical condition.
Do not eat freshness packets enclosed.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.
Storage
Keep freshness packets in bottle until it is empty. Keep bottle tightly closed at all times in between usage.
Store in a cool, dry place after opening.
Formulation
Natural color variation may occur in this product when exposed to air. Speckling in capsule may occur but does not affect product quality. Free Radical Protection Maintains Cellular Health
Non-GMO
Made and quality tested in the USA with globally sourced ingredients.
Not manufactured with wheat, gluten, soy, milk, egg, fish, shellfish, tree nut or sesame ingredients.
FDA Statement of Identity
A Dietary Supplement
Seals/Symbols
Triangle K (Kosher)
Crescent H (Halal) Quality GMP Assured
General Statements
Amino Acids Family owned since 1968.
This bottle is made from 100% PCR (post-consumer recycled) resin.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
NAC 600 mg by NOW label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
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)The Ingredients in NAC 600 mg by NOW
These are the 2 active ingredients this product is made of. Select any to open its full monograph.
Serving size1 Capsule(s) Dosage formCapsule Servings per container100 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.
Selenium
Interacts with321 drugs
Selenium is an essential trace mineral your body needs in small amounts for thyroid function, antioxidant defense, and immune health. Most people who...
Selenium monograph & interactions- › L-Selenomethionine
NAC
Interacts with294 drugs
N-acetyl cysteine (NAC) is a supplement form of the amino acid cysteine and a building block for the antioxidant glutathione. It has well-established...
NAC monograph & interactionsOther (inactive) ingredients: Hypromellose, Stearic Acid, Citric Acid, Microcrystalline Cellulose. These complete the product’s ingredient list but are not active constituents.
NAC 600 mg by NOW Drug Interactions
HelloPharmacist Interaction Report
NOW's NAC 600 mg can interact with several medication types, and the most serious concerns are with nitroglycerin — a heart medication.
NAC (N-acetyl cysteine) can significantly lower blood pressure and trigger severe headaches when combined with intravenous or transdermal nitroglycerin (the patch or IV form).
Read the full breakdown — every affected drug type, severity by severity
NAC may also increase bleeding risk with blood thinners and antiplatelet drugs (like warfarin or aspirin) — clinical evidence shows it can lengthen clotting time and reduce platelet clumping. Blood pressure medications (antihypertensives) are a Moderate concern too; animal studies suggest NAC may amplify their blood-pressure-lowering effects.
Additionally, NAC might weaken the antimalarial drug chloroquine and should not be taken at the same time as activated charcoal, since each can reduce how well the other works.
We could not check the ingredient L-selenomethionine for interactions — we hold no data on it. Altogether, these interactions span 292 individual medications.
Use the medication checker on this page to look up your exact drugs before you start.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against NAC 600 mg?
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 checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in NAC 600 mg interact with 493 drugs. Click any drug to see the details.
2 of the 2 ingredients in NAC 600 mg interact with drugs. Each result below shows which ingredient is responsible. Selenium NAC
NitroglycerinGonitro, Nitro Time, Nitro-Bid, Nitrocine Timecaps, Nitrogard, Nitrogard SR +7 more
How Nitroglycerin interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacNitroglycerin Major
Interaction Summary
N-acetyl cysteine can increase the risk for hypotension and headaches when taken with intravenous or transdermal nitroglycerin.
Read the full Nac + Nitroglycerin interaction6-mercaptopurinePurinethol
How 6-mercaptopurine interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + 6-mercaptopurine interactionAbciximabReoPro
How Abciximab interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Abciximab interactionNacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Abciximab interactionAbrocitinibCibinqo
How Abrocitinib interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Abrocitinib interactionSeleniumImmunosuppressants, Anticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Abrocitinib interactionAcebutololRhotral, Sectral
How Acebutolol interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Acebutolol interactionAcenocoumarolSintrom
How Acenocoumarol interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Acenocoumarol interactionSeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acenocoumarol interactionAcetaminophen, AspirinGemnisyn
How Acetaminophen, Aspirin interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Aspirin interactionNacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Acetaminophen, Aspirin interactionAcetaminophen, Aspirin, CaffeineExcedrin, Excedrin Extra Strength, Excedrin Migraine
How Acetaminophen, Aspirin, Caffeine interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Acetaminophen, Aspirin, Caffeine interactionSeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Aspirin, Caffeine interactionAcetaminophen, ButalbitalAxocet, Bancap, Bucet, Butex Forte, Esgic CF, Orbivan CF +5 more
How Acetaminophen, Butalbital interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital interactionAcetaminophen, Butalbital, CaffeineEsgic, Esgic Plus, Fiogesic, Fioricet, Repan, Tecnal +1 more
How Acetaminophen, Butalbital, Caffeine interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital, Caffeine interactionAcetaminophen, Butalbital, Caffeine, CodeineEsgic with Codeine, Fioricet w/ Codeine
How Acetaminophen, Butalbital, Caffeine, Codeine interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumBarbiturates Moderate
Interaction Summary
Theoretically, selenium might prolong the sedating effects of barbiturates.
Read the full Selenium + Acetaminophen, Butalbital, Caffeine, Codeine interactionAcetaminophen, IbuprofenCombogesic
How Acetaminophen, Ibuprofen interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetaminophen, Ibuprofen interactionNacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Acetaminophen, Ibuprofen interactionAcetazolamideAk-Zol, Diamox
How Acetazolamide interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Acetazolamide interactionAcetylsalicylic AcidEntrophen
How Acetylsalicylic Acid interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Acetylsalicylic Acid interactionSeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Acetylsalicylic Acid interactionAdalimumabHumira
How Adalimumab interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab interactionAdalimumab-adazHyrimoz
How Adalimumab-adaz interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-adaz interactionAdalimumab-adbmCyltezo
How Adalimumab-adbm interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-adbm interactionAdalimumab-afzbAbrilada
How Adalimumab-afzb interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-afzb interactionAdalimumab-attoAmjevita
How Adalimumab-atto interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-atto interactionAdalimumab-bwwdHadlima
How Adalimumab-bwwd interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-bwwd interactionAdalimumab-fkjpHulio
How Adalimumab-fkjp interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Adalimumab-fkjp interactionAlefaceptAmevive
How Alefacept interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Alefacept interactionAlemtuzumabCampath
How Alemtuzumab interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
SeleniumImmunosuppressants Moderate
Interaction Summary
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
Read the full Selenium + Alemtuzumab interactionAliskirenTekturna
How Aliskiren interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Aliskiren interactionAlteplase, TpaActilyse, Activase
How Alteplase, Tpa interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Alteplase, Tpa interactionSeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Alteplase, Tpa interactionAluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium HydroxideAscriptin Codeine #2
How Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
SeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interactionNacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Aluminum Hydroxide, Aspirin, Codeine Phosphate, Magnesium Hydroxide interactionAluminum Hydroxide, Aspirin, Magnesium HydroxideAscriptin
How Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interacts with NAC 600 mg — through 2 ingredients. Tap an ingredient for the detail:
NacAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Read the full Nac + Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interactionSeleniumAnticoagulant/antiplatelet Drugs Moderate
Interaction Summary
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Read the full Selenium + Aluminum Hydroxide, Aspirin, Magnesium Hydroxide interactionAmbrisentanLetairis, Volibris
How Ambrisentan interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Ambrisentan interactionAmilorideAmilamont, Midamor
How Amiloride interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Amiloride interactionAmiloride, HydrochlorothiazideAmil-Co, Amilzide, Moduret 25, Moduretic
How Amiloride, Hydrochlorothiazide interacts with NAC 600 mg — through 1 ingredient. Tap an ingredient for the detail:
NacAntihypertensive Drugs Moderate
Interaction Summary
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Read the full Nac + Amiloride, Hydrochlorothiazide interactionEach ingredient & the kinds of drugs it affects
For each ingredient in NAC 600 mg 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.
Selenium
Anticoagulant/Antiplatelet Drugs
Selenium may have antiplatelet effects and may increase the risk of bleeding if used with anticoagulant or antiplatelet drugs.
Clinical research suggests that taking selenium 10 mcg/kg/day can increase bleeding times by increasing prostacyclin production, which inhibits platelet activity. Other clinical research suggests that taking selenium 75 mcg daily, in combination with ascorbic acid 600 mg, alpha-tocopherol 300 mg, and beta-carotene 27 mg, reduces platelet aggregation.
Barbiturates
Theoretically, selenium might prolong the sedating effects of barbiturates.
Laboratory research suggests that selenium can inhibit the hepatic metabolism of barbiturates. Selenium seems to prolong the sedative effect of pentobarbital in animal models.
Immunosuppressants
Theoretically, selenium supplementation may reduce the effectiveness of immunosuppressant therapy.
In vitro research and preliminary clinical evidence suggests that selenium may stimulate the immune system.
Warfarin (Coumadin)
Theoretically, selenium might interfere with warfarin activity.
Animal research suggests that selenium can increase warfarin activity. Selenium might interact with warfarin by displacing it from albumin binding sites, reducing its metabolism in the liver, or by decreasing production of vitamin K-dependent clotting factors. Selenium can also prolong bleeding times in humans by increasing prostacyclin production, which inhibits platelet activity.
Contraceptive Drugs
Contraceptive drugs might increase levels of selenium, although the clinical significance of this effect is unclear.
Some research suggests that oral contraceptives increase serum selenium levels in women taking oral contraceptives; however, other research shows no change in selenium levels. It is suggested that an increase could be due to increased carrier proteins, indicating a redistribution of selenium rather than a change in total body selenium.
Niacin
Selenium might reduce the beneficial effects of niacin on high-density lipoprotein (HDL) levels.
A combination of niacin and simvastatin (Zocor) effectively raises HDL cholesterol levels in patients with coronary disease and low HDL levels. Clinical research shows that taking a combination of antioxidants (vitamin C, vitamin E, beta-carotene, and selenium) along with niacin and simvastatin (Zocor) attenuates this rise in HDL, specifically the HDL-2 and apolipoprotein A1 fractions, by more than 50% in patients with coronary disease. It is not known whether this adverse effect is due to a single antioxidant such as selenium, or to the combination. It also is not known whether it will occur in other patient populations.
NAC
Nitroglycerin
N-acetyl cysteine can increase the risk for hypotension and headaches when taken with intravenous or transdermal nitroglycerin.
Clinical research shows that concomitant administration of N-acetyl cysteine and intravenous or transdermal nitroglycerin can cause severe hypotension and intolerable headaches. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Activated Charcoal
N-acetyl cysteine might reduce the effects of activated charcoal, while activated charcoal might reduce the absorption of N-acetyl cysteine.
N-acetyl cysteine appears to reduce the capacity of activated charcoal to adsorb acetaminophen and salicylic acid. Conversely, although clinical research suggests that although activated charcoal can reduce the absorption of N-acetyl cysteine by up to 40%, it does not seem to reduce its clinical effects. Other clinical evidence suggests that activated charcoal does not affect the absorption of N-acetyl cysteine.
Anticoagulant/Antiplatelet Drugs
Theoretically, N-acetyl cysteine might increase the risk of bleeding when taken with anticoagulant or antiplatelet drugs.
Clinical research suggests that intravenous N-acetyl cysteine decreases prothrombin time, prolongs coagulation time, decreases platelet aggregation, and increases blood loss in surgical patients. Furthermore, in vitro research suggests that N-acetyl cysteine increases the anticoagulant activity of nitroglycerin.
Antihypertensive Drugs
Theoretically, N-acetyl cysteine might increase the risk of hypotension when taken with antihypertensive drugs.
Animal research suggests that N-acetyl cysteine potentiates the hypotensive effects of the angiotensin-converting enzyme inhibitors (ACEIs) captopril and enalaprilat. Theoretically, combining N-acetyl cysteine with other antihypertensive drugs might increase the risk of hypotension.
Chloroquine (Aralen)
Theoretically, N-acetyl cysteine might interfere with the antimalarial effects of chloroquine.
Animal research suggests that N-acetyl cysteine might reduce the antimalarial effects of chloroquine by increasing cellular levels of glutathione.
Brand information
Manufacturer and brand details for NAC 600 mg, from the product label.
NOW
See all NOW products- Name
- NOW FOODS
- Street Address
- 395 S. Glen Ellyn Rd.
- City
- Bloomingdale
- State
- IL
- ZipCode
- 60108
- Web Address
- nowfoods.com
NAC 600 mg by NOW: Common Questions
Does NAC 600 mg by NOW interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
What exactly is NAC and what is it used for?
Can I take this if I'm pregnant?
What side effects should I watch for?
Why is there Selenium in an NAC product, and do you have interaction data for it?
Is this safe to take with my blood pressure medication?
Does this product have any fillers?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if NAC 600 mg is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
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.
The Full Monographs Behind NAC 600 mg’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Selenium
Interacts with 321 drugsSelenium is an essential trace mineral your body needs in small amounts for thyroid function, antioxidant defense, and immune health. Most people who eat a varied diet get enough, and supple...
Read the full Selenium monograph → Herb & supplement monographN-acetyl Cysteine (nac)
Interacts with 294 drugsN-acetyl cysteine (NAC) is a supplement form of the amino acid cysteine and a building block for the antioxidant glutathione. It has well-established prescription uses for acetaminophen over...
Read the full N-acetyl Cysteine (nac) monograph →Sources & How We Checked
NAC 600 mg'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.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
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 122 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.
Selenium 36 references
- Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin C, Vitamin E, Selenium, and Carotenoids. Washington, DC: National Academy Press, 2000. Available at: http://www.nap.edu/books/0309069351/html/.
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