Drug & supplement interaction

Paleo Diet + Phenylephrine

Phenylephrine brand names: Gilchew, AH Chew D, Gilchew IR, Sudafed PE, Biorphen.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Oct 4, 2026
The bottom line No known interaction

We found no known interaction between Paleo Diet and Phenylephrine 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.

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Interaction report

Paleo Diet and Phenylephrine

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 Phenylephrine and Paleo Diet in our sources. This does not guarantee that the combination is completely free of risk — research on Paleo Diet alongside specific medications may be limited.

Worth understanding: our licensed dataset holds no drug-interaction record for Paleo Diet at all — not against Phenylephrine, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

Paleo Diet is an eating pattern rather than something you take. Ask your pharmacist or doctor before changing how you eat while on a prescribed medicine: some medicines are dosed around meals, and a change in diet can change how they work. 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.

Paleo Diet safety at a glance

Paleo Diet overall Use caution Generally safe for healthy adults short-term, but it can be restrictive and may miss some nutrients.
Pregnancy Use caution May lack calcium, vitamin D, and other nutrients important in pregnancy, so get medical guidance first.
Breastfeeding Use caution Nutrient needs are high while nursing, so check with your doctor or dietitian before following a restrictive plan.

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

Still wondering about combining Phenylephrine and Paleo Diet? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Paleo Diet Itself Has Been Linked To

This is not an interaction — nothing below involves Phenylephrine. It is the side-effect record for Paleo Diet on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Paleo Diet, this list is the first place to look.

  • Weight loss Additional detail

    “In one case report, a breastfeeding woman reported to the emergency room with ketoacidosis after starting to follow the paleo diet. The ketoacidosis was attributed to the weight loss and carbohydrate deficit created by the diet in conjunction with the increased energy demands during lactation.”

    Paleo Diet · Natural Medicines adverse-effect record, reported in lactation.

    1 source cited
    1. 98133. Diamond, Evan, MD; Tibaldi, Joseph, MD. A case of ketoacidosis in a breastfeeding patient on the paleo diet. Endocrine Practice, suppl. Supplement 2; Jacksonville Vol. 22: 177.

Everything above comes from the Natural Medicines adverse-effect record for Paleo Diet — expand a row for the licensed statement it rests on. We read the ADVERSE REACTIONS section of Phenylephrine’s FDA label too, and the two lists don’t meaningfully overlap — which is why no Phenylephrine column appears here.

From our Q&A

Questions About Paleo Diet or Phenylephrine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Paleo Diet or Phenylephrine, 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 Phenylephrine

This page covers Paleo Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phenylephrine page lists 81 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Ephedra (major), Lithium (major), Peyote (major) and Rauvolfia Vomitoria (major).

By severity: 6 major · 60 moderate · 15 minor.

From our pharmacist’s overview on the Phenylephrine page

“If you take phenylephrine (Sudafed PE, Biorphen) for congestion, treat this list as one that needs real attention, since six of its 81 entries carry a major rating. Phenylephrine tightens blood vessels to clear your nose, and more than half of the interactions here come from stimulant ingredients, ephedra above all, that can push blood…”

Reviewed by 2 · Jul 18, 2026

Open the Phenylephrine interaction page

How much people look this up

Where Paleo Diet and Phenylephrine 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 Paleo Diet
Steady interest

#1,395 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Phenylephrine
Top 25%

#444 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 Paleo Diet reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified October 4, 2026. The Paleo Diet and Phenylephrine 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 .
Eating pattern

About Paleo Diet

What is Paleo Diet?

  • Weight loss
  • Better blood sugar control
  • Heart health
  • Reducing processed-food intake
  • General wellness and energy

The Paleo diet is an eating pattern based on whole, minimally processed foods thought to resemble what early humans ate, while avoiding grains, legumes, dairy, and added sugar. Short-term studies suggest it may help with weight loss and some heart and blood-sugar markers, but long-term safety and benefits are not well proven. Talk with your doctor or a dietitian before making big diet changes, especially if you have a health condition.

Whole-food eating pattern (meats, fish, eggs, vegetables, fruits, nuts, and seeds)

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

Paleo Diet: dosing

Because the Paleo diet is an eating pattern and not a supplement, there is no standard "dose." Instead, it is defined by which foods are included or avoided.If you want to try it, focus on whole foods like vegetables, fruits, lean meats, fish, eggs, nuts, and seeds, and limit processed foods and added sugar. Many people do not need to follow every strict rule to gain benefit from eating fewer processed foods.It is a good idea to work with a doctor or registered dietitian, who can help you plan balanced meals and decide whether a supplement (such as calcium or vitamin D) might be needed.

From our Paleo Diet monograph — the full record covers uses, side effects and every documented interaction.

Read the full Paleo Diet monograph & all interactions
Medication

About Phenylephrine

What Is Phenylephrine Used For?

Brand names: Gilchew, AH Chew D, Gilchew IR, Sudafed PE, Biorphen

Phenylephrine is used in several different products, and each one has its own use.

Injection (IV): raises blood pressure in adults with clinically important hypotension (low blood pressure) caused mainly by widened blood vessels. Some injections are labeled for anesthesia only. Others are labeled for anesthesia and septic shock.

Eye drops: Phenylephrine Hydrochloride Ophthalmic Solution is used to dilate the pupil.

Nasal products: temporarily relieve nasal and sinus congestion from the common cold, hay fever or other upper respiratory allergies.

Rectal suppositories: relieve itching, burning and discomfort from hemorrhoids and temporarily shrink hemorrhoidal tissue.

Most-Reported Side Effects for Phenylephrine

From FAERS, the FDA’s public side-effect reporting system (221,388 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 20,609 reports
Headache 17,301 reports
Nausea 16,925 reports
Diarrhea 14,221 reports
Dyspnea 13,719 reports
See full Phenylephrine drug information
Keep checking

Other Drugs & Paleo Diet

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

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Paleo Diet against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Paleo Diet list.

See the full Paleo Diet interactions page
See every supplement checked against Phenylephrine, ranked by severity
Evidence & sources

Paleo Diet References

The 14 references that drive our Paleo Diet 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. Jonsson, T., Granfeldt, Y., Ahren, B., Branell, U. C., Palsson, G., Hansson, A., Soderstrom, M., and Lindeberg, S. Beneficial effects of a Paleolithic diet on cardiovascular risk factors in type 2 diabetes: a randomized cross-over pilot study. Cardiovasc
  2. Lindeberg, S., Jonsson, T., Granfeldt, Y., Borgstrand, E., Soffman, J., Sjostrom, K., and Ahren, B. A Palaeolithic diet improves glucose tolerance more than a Mediterranean-like diet in individuals with ischaemic heart disease. Diabetologia 2007;50(9):179 PubMed
  3. Baumgartner, S., Imfeld, T., Schicht, O., Rath, C., Persson, R. E., and Persson, G. R. The impact of the stone age diet on gingival conditions in the absence of oral hygiene. J Periodontol 2009;80(5):759-768. PubMed
  4. Osterdahl, M., Kocturk, T., Koochek, A., and Wandell, P. E. Effects of a short-term intervention with a paleolithic diet in healthy volunteers. Eur J Clin Nutr 2008;62(5):682-685. PubMed
  5. Ryberg, M., Sandberg, S., Mellberg, C., Stegle, O., Lindahl, B., Larsson, C., Hauksson, J., and Olsson, T. A Palaeolithic-type diet causes strong tissue-specific effects on ectopic fat deposition in obese postmenopausal women. J Intern Med 2013;274(1):67- PubMed
  6. Diamond, Evan, MD; Tibaldi, Joseph, MD. A case of ketoacidosis in a breastfeeding patient on the paleo diet. Endocrine Practice, suppl. Supplement 2; Jacksonville Vol. 22: 177.
  7. Fenton TR, Fenton CJ. Paleo diet still lacks evidence. Am J Clin Nutr. 2016;104(3):844. PubMed
  8. Manheimer EW, van Zuuren EJ, Fedorowicz Z, Pijl H. Paleolithic nutrition for metabolic syndrome: systematic review and meta-analysis. Am J Clin Nutr. 2015;102(4):922-32. PubMed
  9. Pastore RL, Brooks JT, Carbone JW. Paleolithic nutrition improves plasma lipid concentrations of hypercholesterolemic adults to a greater extent than traditional heart-healthy dietary recommendations. Nutr Res. 2015;35(6):474-9. PubMed
  10. Mellberg C, Sandberg S, Ryberg M, et al. Long-term effects of a Palaeolithic-type diet in obese postmenopausal women: a 2-year randomized trial. Eur J Clin Nutr. 2014;68(3):350-7. PubMed
  11. Jamka M, Kulczynski B, Juruc A, Gramza-Michalowska A, Stokes CS, Walkowiak J. The effect of the paleolithic diet vs. healthy diets on glucose and insulin homeostasis: a systematic review and meta-analysis of randomized controlled trials. J Clin Med 2020;9 PubMed
  12. Lee JE, Titcomb TJ, Bisht B, Rubenstein LM, Louison R, Wahls TL. A modified MCT-based ketogenic diet increases plasma ß-hydroxybutyrate but has less effect on fatigue and quality of life in people with multiple sclerosis compared to a modified paleolithic
  13. Ghaedi E, Mohammadi M, Mohammadi H, et al. Effects of a paleolithic diet on cardiovascular disease risk factors: a systematic review and meta-analysis of randomized controlled trials [published correction appears in Adv Nutr 2020 Jul 1;11(4):1054]. Adv Nu PubMed
  14. Sohouli MH, Fatahi S, Lari A, et al. The effect of paleolithic diet on glucose metabolism and lipid profile among patients with metabolic disorders: a systematic review and meta-analysis of randomized controlled trials. Crit Rev Food Sci Nutr 2021;1-12. 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

Following Paleo Diet While Taking Phenylephrine: Common Questions

Is it safe to follow Paleo Diet while taking Phenylephrine?
We do not list a known interaction between Paleo Diet and Phenylephrine. 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.
Does Phenylephrine interact with any supplements?
Yes. Phenylephrine has documented interactions with 81 supplements in our database — Paleo Diet is not one of them. The Phenylephrine 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

Paleo Diet monograph Uses, safety profile, and every drug interaction in one place Phenylephrine drug information The full plain-English guide to this medication Phenylephrine supplement interactions Every supplement checked against Phenylephrine, 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 14 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Phenylephrine and Paleo Diet?

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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.