Drug & supplement interaction

Phenethylamine (pea) + Desloratadine

Desloratadine brand name: Clarinex.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 27, 2026
The bottom line No known interaction

We found no known interaction between Phenethylamine (pea) and Desloratadine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.

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Interaction report

Phenethylamine (pea) and Desloratadine

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Desloratadine and Phenethylamine (pea) in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Phenethylamine (pea) safety at a glance

Phenethylamine (pe... overall Use caution May affect heart rate and blood pressure, and human safety data for supplements is limited.
Pregnancy Avoid Not enough safety information; best avoided during pregnancy.
Breastfeeding Avoid Not enough safety information; best avoided while breastfeeding.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Desloratadine and Phenethylamine (pea)? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Desloratadine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Desloratadine is filed under 2 classifications — seizure threshold lowering drugs, oral drugs. Phenethylamine (pea) has documented interactions with 2 drug classes — the most serious being monoamine oxidase inhibitors (maois) (moderate) and serotonergic drugs (moderate) — and none of Desloratadine’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Phenethylamine (pea) Does Interact With Other Medications

Phenethylamine (pea) has 187 moderate known drug interactions in our database — Desloratadine isn’t one of them. If you take anything else, check it against the full list below.

Moderate 187 No known interaction 2,643 (incl. Desloratadine)
Taking anything else?

Check Another of Your Medications Against Phenethylamine (pea)

Covers the 2,830 medications we’ve checked against Phenethylamine (pea). Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Phenethylamine (pea) and Desloratadine May Share a Side Effect

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • A fast or pounding heartbeat Additional detail

    Phenethylamine (pea)

    “A case of tachycardia has been reported for an individual who consumed a weight loss product containing phenethylamine 200-300 mg, as well as caffeine 500-750 mg, bitter orange 400-600 mg, willow bark 150-225 mg, cayenne pepper 80-120 mg, 1,3-dimethyloamyloamine 70-105 mg, gooseberry extract 40-60 mg, bergamot orange 40-60 mg, and black pepper 10-15 mg, daily for 2 months.”

    Phenethylamine (pea) · Natural Medicines adverse-effect record, reported in myasthenia gravis.

    1 source cited
    1. 24343. Lukasik-Glebocka M, Sommerfeld K, Tezyk A, et al. [Acute poisoning with weight-loss dietary supplement falsely suggesting the use of amphetamine]. Przegl Lek. 2013;70(10):880-3.

    Desloratadine

    Listed in the ADVERSE REACTIONS section of the FDA label for Desloratadine. Read the label on DailyMed ›

Reported for Phenethylamine (pea) but not commonly for Desloratadine: weight loss and anxiety or restlessness.

Effects for Desloratadine come from the ADVERSE REACTIONS section of its FDA label; effects for Phenethylamine (pea) come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 10,700 voluntary FDA FAERS reports for Desloratadine that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

From our Q&A

Questions About Phenethylamine (pea) or Desloratadine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Phenethylamine (pea) or Desloratadine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Desloratadine

This page covers Phenethylamine (pea) only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Desloratadine page lists 23 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Biofeedback (moderate), Coffee Charcoal (moderate), Dendrobium (moderate) and European Mandrake (moderate).

By severity: 1 major · 13 moderate · 9 minor.

From our pharmacist’s overview on the Desloratadine page

“An allergy pill only helps if it gets absorbed, and most of desloratadine's (Clarinex) supplement interactions come down to exactly that. Bulk-forming fibers, gums, and charcoal products can trap the medication in the gut, with activated charcoal the standout, the sole major rating here and one I would not take near a dose.”

Reviewed by 2 · Jul 18, 2026

Open the Desloratadine interaction page

One more smart check

Taking Phenethylamine (pea) as Part of a Dietary Supplement Product? Check It for Interactions

We hold 208 real supplement products containing Phenethylamine (pea), each one broken down to its full ingredient list — and combination products often carry several ingredients besides Phenethylamine (pea). Even though Phenethylamine (pea) itself has no known interaction with Desloratadine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Phenethylamine (pea) and Desloratadine Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Phenethylamine (pea)
Top half

#427 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Desloratadine
Steady interest

#2,408 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Phenethylamine (pea) reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 27, 2026. The Phenethylamine (pea) and Desloratadine records this page draws on were last updated July 10, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Phenethylamine (pea)

What is Phenethylamine (pea)?

Phenethylamine (pea)
  • Mood support
  • Focus and concentration
  • Energy and pre-workout boost
  • Feeling of well-being
  • Athletic performance

Phenethylamine (PEA) is a natural compound made in the body and found in foods like chocolate; supplements are marketed for mood, focus, and energy. Reliable human research on the supplement is very limited, and it may raise blood pressure or heart rate, so people with heart or blood pressure problems should be cautious and check with a pharmacist or doctor first.

Not a plant part; a naturally occurring monoamine compound (made in the body and found in some foods) · Capsules, tablets, powders (often combined with other ingredients in pre-workout or 'mood' and 'focus' supplements)

An interaction check asks whether these two react with each other — it does not ask whether Phenethylamine (pea) is a good idea for someone in your situation. Here is what our Phenethylamine (pea) record says about it on its own.

Phenethylamine (pea): dosing

There is no well-established or standardized dose for PEA supplements, and reliable studies on safe and effective amounts are lacking. Products vary widely in how much they contain and what else they are combined with.If you choose to try it, follow the directions on the product label and do not exceed the recommended amount.

From our Phenethylamine (pea) monograph — the full record covers uses, side effects and every documented interaction.

Read the full Phenethylamine (pea) monograph & all interactions
Medication

About Desloratadine

What Is Desloratadine Used For?

Brand name: Clarinex

Desloratadine treats nasal and non-nasal symptoms of seasonal allergic rhinitis (hay fever) and perennial allergic rhinitis (year-round allergies). It also provides symptomatic relief for chronic idiopathic urticaria — ongoing hives with no identified cause — reducing itching, the number of hives, and their size.

Age eligibility varies by product. Desloratadine tablets (including Clarinex tablets) are approved for patients 12 years and older. Desloratadine orally disintegrating tablets are approved for patients 6 years and older for allergic rhinitis and chronic idiopathic urticaria. Desloratadine Oral Solution is approved for the youngest patients — down to 6 months of age for perennial allergic rhinitis and chronic idiopathic urticaria, and down to 2 years for seasonal allergic rhinitis.

Most-Reported Side Effects for Desloratadine

From FAERS, the FDA’s public side-effect reporting system (10,700 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 616 reports
Nausea 604 reports
Dyspnea 544 reports
Headache 477 reports
Diarrhea 460 reports
See full Desloratadine drug information
Keep checking

Other Drugs & Phenethylamine (pea)

Browse every other medication we’ve checked against Phenethylamine (pea) — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
187Moderate
0Minor
2,642No known interaction
187 Moderate 2,642 No interaction
Moderate

187 interactions

Showing 60 of 187 moderate interactions — see all 187 on the Phenethylamine (pea) page.

No interaction 2,642 drugs checked — show the list

We also checked Phenethylamine (pea) against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,642 medications checked with no known interaction — see the full Phenethylamine (pea) list.

See the full Phenethylamine (pea) interactions page
See every supplement checked against Desloratadine, ranked by severity
Evidence & sources

Phenethylamine (pea) References

The 9 references that drive our Phenethylamine (pea) monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Singhal AB, Caviness VS, Begleiter AF, et al. Cerebral vasoconstriction and stroke after use of serotonergic drugs. Neurology 2002;58:130-3. PubMed
  2. Sabelli H, Fink P, Fawcett J, et al. Sustained antidepressant effect of PEA replacement. J Neuropsychiatry Clin Neurosci. 1996;8(2):168-71.
  3. Xie Z, Miller G. Beta-phenylehtylamine alters monoamine transporter function via trace amine-associated receptor 1: implication for modulatory roles of trace amines in brain. J Pharmacol Exp Ther. 2008;325(2):617-28.
  4. Lukasik-Glebocka M, Sommerfeld K, Tezyk A, et al. [Acute poisoning with weight-loss dietary supplement falsely suggesting the use of amphetamine]. Przegl Lek. 2013;70(10):880-3.
  5. Nakamura M, Ishii A, Nakahara D. Characterization of beta-phenyltheylamine-induced monoamine release in rat nucleus accumbens: a microdialysis study. Eur J Pharmacol. 1998;349(2-3):163-9.
  6. Bailey B, Philips S, Boulton A. In vivo release of endogenous dopamine, 5-hydroxytryptamine and some of their metabolites from rat caudate nucleus by phenylethylamine. Neurochem Res. 1987;12(2):173-8. PubMed
  7. Mantegazza P, Riva M. Amphetamine-like activity of beta-phenethylamine after a monoamine oxidase inhibitor in vivo. Journal of Pharmacy and Pharmacology. 1963;151(1):472-8.
  8. Grimsby J, Toth M, Chen K, et al. Increased stress response and beta-phenylethylamine in MAOB-deficient mice. Nat Genet. 1997;17(2):206-10.
  9. Lindemann L, Hoener MC. A renaissance in trace amines inspired by a novel GPCR family. Trends Pharmacol Sci. 2005;26(5):274-81. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Phenethylamine (pea) and Desloratadine Together: Common Questions

Is it safe to take Phenethylamine (pea) with Desloratadine?
We do not list a known interaction between Phenethylamine (pea) and Desloratadine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Do Phenethylamine (pea) and Desloratadine have any of the same side effects?
Yes — our sources link each of them separately to one of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
How was the Phenethylamine (pea) and Desloratadine combination checked?
Interactions in our licensed database are recorded against drug classes. Desloratadine is filed under 2 classifications, and Phenethylamine (pea) has documented interactions with 2 drug classes — none of Desloratadine's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Phenethylamine (pea) interact with any other medications?
Yes. Phenethylamine (pea) has 187 documented drug interactions in our database — Desloratadine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Desloratadine interact with any supplements?
Yes. Desloratadine has documented interactions with 23 supplements in our database — Phenethylamine (pea) is not one of them. The Desloratadine interaction page linked on this page lists every one, ranked by severity.

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

Where next

Keep Exploring

Phenethylamine (pea) monograph Uses, safety profile, and every drug interaction in one place Desloratadine drug information The full plain-English guide to this medication Desloratadine supplement interactions Every supplement checked against Desloratadine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 9 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Desloratadine and Phenethylamine (pea)?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.