Drug & supplement interaction

1,4-dmaa + Oxymetazoline Hydrochloride

Oxymetazoline Hydrochloride brand names: Afrin, Rhofade, Upneeq.

Moderate Interaction
Medically reviewed by · Updated September 2026
The bottom line Moderate

1,4-dmaa has a moderate interaction with Oxymetazoline Hydrochloride. 1,4-DMAA is thought to have stimulant and vasoconstrictive effects, which have been demonstrated in animal studies.

Read the full interaction report
SeverityModerate
LikelihoodPossible
EvidenceD
What do Severity, Likelihood & Evidence mean?
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Interaction report

1,4-dmaa and Oxymetazoline Hydrochloride

Here is the interaction we found between these two, with the evidence behind it.

Moderate

STIMULANT DRUGS

Why this applies to Oxymetazoline Hydrochloride

Oxymetazoline Hydrochloride falls under STIMULANT DRUGS — the group 1,4-dmaa interacts with.

1,4-DMAA is thought to have stimulant and vasoconstrictive effects, which have been demonstrated in animal studies. Theoretically, taking 1,4-DMAA with stimulant drugs might increase the risk of adverse cardiovascular effects. Some stimulant drugs include amphetamine, caffeine, diethylpropion (Tenuate), methylphenidate, phentermine (Ionamin), pseudoephedrine (Sudafed, others), and many others.
Severity Moderate Likelihood Possible Evidence D

Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.

Dr. Brian Staiger, PharmD, BCPS
Dr. Brian Staiger explains PharmD, Clinical Pharmacist

Here's the simple version. Oxymetazoline (like Afrin nasal spray or Rhofade cream) works by tightening blood vessels, and DMAA is a stimulant that does much the same thing throughout your body. Stacking two vessel-narrowing, adrenaline-like substances could, in theory, push your blood pressure up or strain your heart more than either one alone. With facial creams like Rhofade and small nasal doses, very little usually reaches the bloodstream, so the real-world risk is likely low for most people.

That said, this concern is based on how these substances should behave, not on solid human studies. Honestly, my bigger worry is DMAA itself, which the FDA considers unsafe. Please talk with your pharmacist or doctor before combining them.

Contact Dr. Brian directly if you have additional questions on this interaction
References
  1. Cohen PA, Travis JC, Keizers PHJ, Deuster P, Venhuis BJ. Four experimental stimulants found in sports and weight loss supplements: 2-amino-6-methylheptane (octodrine), 1,4-dimethylamylamine (1,4-DMAA), 1,3-dimethylamylamine (1,3-DMAA) and 1,3-dimethylbuty

What These Ratings Mean

Every interaction above is graded three ways — here’s the key to each label.

Severity how clinically significant the interaction is
Major

Clinically significant. Avoid the combination, or use only under close professional supervision.

Moderate

Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.

Minor

Generally not serious. Be aware of it and mention it to your pharmacist.

Likelihood how strong the evidence is that the interaction actually happens in people
  • LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
  • ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
  • PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
  • UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
Evidence the quality of the studies behind the rating (graded A–D)
  • AHigh-quality meta-analysis (quantitative systematic review).
  • BCase-control study.
  • CConsensus.
  • DAnecdotal evidence.

These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.

Keep it in perspective

1,4-dmaa Also Interacts With Other Medications

1,4-dmaa has 171 moderate known drug interactions in our database — the Oxymetazoline Hydrochloride one above is one of them. If you take anything else, check it against the full list below.

Moderate 171 No known interaction 2,659 (incl. Oxymetazoline Hydrochloride)
Taking anything else?

Check Another of Your Medications Against 1,4-dmaa

Covers the 2,830 medications we’ve checked against 1,4-dmaa. Pick one to open its full report.

Everything else you take

See Every Supplement That Interacts With Oxymetazoline Hydrochloride

This page covers 1,4-dmaa only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Oxymetazoline Hydrochloride page lists 48 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Ephedra (major), Peyote (major), Rauvolfia Vomitoria (major), Sida Cordifolia (major) and 1,3-dmaa (moderate).

By severity: 4 major · 39 moderate · 5 minor.

Open the Oxymetazoline Hydrochloride interaction page

How much people look this up

Where 1,4-dmaa and Oxymetazoline Hydrochloride 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 1,4-dmaa
Steady interest

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

29 days ago today
Medication Oxymetazoline Hydrochloride
Steady interest

#2,026 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.

Supplement

About 1,4-dmaa

What is 1,4-dmaa?

  • Energy and stimulation
  • Weight loss
  • Athletic performance
  • Focus and concentration

1,4-DMAA is a synthetic stimulant that the U.S. FDA has determined is not a legal dietary ingredient and considers unsafe in supplements. It has been linked to serious heart and blood pressure problems, and we recommend avoiding it entirely.

Read the full 1,4-dmaa monograph & all interactions
Medication

About Oxymetazoline Topical

What Is Oxymetazoline Topical Used For?

Brand names: Afrin, Rhofade, Upneeq

The cream form (Rhofade, oxymetazoline hydrochloride cream 1%) is used on the skin to treat persistent facial redness (erythema) from rosacea in adults.

Other products in this group, such as Afrin spray and the nasal solutions listed, carry over-the-counter warnings. These warnings refer to nasal congestion, but the supplied evidence does not list a full indication for them.

See full Oxymetazoline Topical drug information
Keep checking

Other Drugs & 1,4-dmaa

Browse every other medication we’ve checked against 1,4-dmaa — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
171Moderate
0Minor
2,658No known interaction
171 Moderate 2,658 No interaction
Moderate

171 interactions

Showing 60 of 171 moderate interactions — see all 171 on the 1,4-dmaa page.

No interaction 2,658 drugs checked — show the list

We also checked 1,4-dmaa against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,658 medications checked with no known interaction — see the full 1,4-dmaa list.

See the full 1,4-dmaa interactions page
See every supplement checked against Oxymetazoline Hydrochloride, ranked by severity
Sources

Sources & How We Checked

Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.

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

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

Keep exploring
1,4-dmaa monograph › Uses, safety, and every drug interaction in one place Oxymetazoline Hydrochloride supplement interactions › Every supplement checked against Oxymetazoline Hydrochloride, ranked by severity Oxymetazoline Topical drug information › The full plain-English guide to this medication Supplement interaction checker › Check any supplement or product against your medications Browse medications A–Z › Every drug we've checked against herbs & supplements Ask a pharmacist › Free, personal answer from our licensed team
Pharmacist Counseling Corner

Taking 1,4-dmaa and Oxymetazoline Hydrochloride Together: Common Questions

Can you take 1,4-dmaa with Oxymetazoline Hydrochloride?
There is a moderate interaction, so it may be acceptable with monitoring or timing changes — but check with your pharmacist first. Read the full details on this page and confirm with your pharmacist before combining them.
How serious is the 1,4-dmaa and Oxymetazoline Hydrochloride interaction?
We rate it Moderate. This combination may require monitoring, a dose adjustment, or separating the times you take each one. Consult your pharmacist before using them together.

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

Still Have a Question About Oxymetazoline Hydrochloride and 1,4-dmaa?

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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.