Vegetarian Diet + Phentermine
Phentermine brand names: Adipex-P, Fastin, T Diet, Phentride, Obenix, and others.
We found no known interaction between Vegetarian Diet and Phentermine 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.
Vegetarian Diet and Phentermine
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 Phentermine and Vegetarian Diet in our sources. This does not guarantee that the combination is completely free of risk — research on Vegetarian Diet alongside specific medications may be limited.
Worth understanding: our licensed dataset holds no drug-interaction record for Vegetarian Diet at all — not against Phentermine, 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.
Vegetarian 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.
Vegetarian Diet safety at a glance
Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Vegetarian Diet in Pregnancy & Breastfeeding
When used appropriately. A position statement from the Academy of Nutrition and Dietetics indicates that a nutritionally adequate vegetarian diet is appropriate during pregnancy and lactation. Following a vegetarian diet when pregnant or lactating should not pose a risk to the child as long as nutritional needs are met. Nutrients of concern may include omega-3 fatty acids, iron, zinc, calcium, vitamin D, and vitamin B12. Additionally, one small observational study has found that consuming a vegetarian diet during pregnancy is not associated with lower cognitive function, as measured by intelligence quotient (IQ), in the child at 6-7 years of age. Although some observational research has found an association between consuming a vegetarian diet during pregnancy and an increased risk for low birth weight or small for gestational age (SGA), most research has not accounted for diet variability or adherence or controlled for nutritional status or body mass index. When specific vegetarian diets are examined, only a vegan diet, not a lacto-ovo-vegetarian diet, has been associated with an increased risk of SGA or low birth weight.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center
What Phentermine Is Prescribed For, and What Vegetarian Diet Has Been Studied For
These two come up together because they touch the same health topic — not because they do the same job. Phentermine is a prescription medicine with approved uses on its FDA label. Vegetarian Diet is an eating pattern: what follows is what researchers have looked at it for, and how strong that evidence is.
Phentermine is prescribed for: Phentermine is approved as a short-term addition to a weight-loss program — not a standalone treatment. It is used alongside reduced-calorie eating, increased physical activity, and behavior changes to help manage obesity in adults whose body mass index (BMI) is 30 kg/m² or higher, or 27 kg/m² or higher when other risk factors such as controlled high blood pressure, diabetes, or high cholesterol (hyperlipidemia) are also present. All available phentermine products — including Adipex-P, Lomaira, and various generic capsules and tablets — share this same FDA-approved use. Lomaira tablets are specifically dosed to be taken three times daily before meals, while other formulations are generally taken once daily.
Read the rest of what Phentermine is prescribed for
Treatment is intended to last only a few weeks.
Vegetarian Diet has been studied for:
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Obesity Natural Medicines rates the evidence for Vegetarian Diet: Possibly Effective Read what the research shows
Vegetarian Diet for obesity
Consuming a vegetarian diet for at least 3 months modestly reduces body weight and may be beneficial in overweight or obese individuals.
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Diabetes Natural Medicines rates the evidence for Vegetarian Diet: Possibly Effective Read what the research shows
Vegetarian Diet for diabetes
The vegetarian diet is a healthy dietary pattern option for patients with diabetes. Some early research suggests that following a vegetarian diet may be beneficial for the prevention of diabetes.
Effectiveness ratings and the research summaries above are the verbatim record from the Natural Medicines database, which grades evidence from “Effective” down to “Insufficient Reliable Evidence To Rate”. A rating below the top of that scale means researchers have looked at it — not that it works, and never that it can stand in for a prescribed medicine. Do not stop or replace Phentermine on your own; if you are taking Vegetarian Diet for the same health topic, tell your prescriber, especially if the medicine is being adjusted to a target.
Questions About Vegetarian Diet or Phentermine
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Vegetarian Diet or Phentermine, 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:
- Can You Take Phentermine With Berberine? ›
- Interaction Question: Omeprazole, Spironolactone And Phentermine ›
- Lomaira With Pristiq - Interaction Details ›
Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.
See Every Supplement That Interacts With Phentermine
This page covers Vegetarian Diet only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Phentermine page lists 61 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Ephedra (major), Peyote (major), Rauvolfia Vomitoria (major) and Sida Cordifolia (major).
By severity: 5 major · 43 moderate · 13 minor.
From our pharmacist’s overview on the Phentermine page
“Ephedra is the pairing I most want anyone taking phentermine (Adipex-P) to know about. Phentermine is itself a stimulant appetite suppressant that raises heart rate and blood pressure, and ephedra piles the same cardiovascular strain on top of it.”
Reviewed by 2 · Jul 18, 2026
Where Vegetarian Diet and Phentermine 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.
#1,394 of 1,452 supplements looked up here in the last 7 days
#390 of 2,830 medications looked up here in the last 7 days
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 Vegetarian Diet reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Vegetarian Diet and Phentermine 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.
About Vegetarian Diet
What is Vegetarian Diet?
- Heart health
- Weight management
- Blood sugar control
- Lowering cholesterol
- Ethical or environmental reasons
- General wellness
A vegetarian diet emphasizes plant foods and avoids meat, and when well-planned it is linked with lower risks of heart disease, high blood pressure, and type 2 diabetes. It can be very healthy but needs attention to certain nutrients like vitamin B12, iron, and protein. Talk with a doctor or dietitian before making major dietary changes, especially if you are pregnant, nursing, or have a health condition.
Whole-food eating pattern (no specific product form)
An interaction check asks whether these two react with each other — it does not ask whether Vegetarian Diet is a good idea for someone in your situation. Here is what our Vegetarian Diet record says about it on its own.
Vegetarian Diet: dosing
There is no "dose" for a vegetarian diet. Instead, the goal is a balanced, varied eating pattern built around vegetables, fruits, whole grains, beans and lentils, nuts, seeds, and (if included) dairy and eggs.Many vegetarians, especially vegans, benefit from a vitamin B12 supplement or B12-fortified foods. Some also need iron, vitamin D, calcium, or omega-3 supplements depending on their individual needs and lab results.
From our Vegetarian Diet monograph — the full record covers uses, side effects and every documented interaction.
About Phentermine
What Is Phentermine Used For?
Brand names: Adipex-P, Fastin, T Diet, Phentride, Obenix, Pbc Phentride, Pbw Phentride, Phentrol #3, Ionamin, Phentrol #6, Phentrol #2, Phentrol #5, Phentrol, Obermine, Phentermine, Suprenza
Phentermine is approved as a short-term addition to a weight-loss program — not a standalone treatment. It is used alongside reduced-calorie eating, increased physical activity, and behavior changes to help manage obesity in adults whose body mass index (BMI) is 30 kg/m² or higher, or 27 kg/m² or higher when other risk factors such as controlled high blood pressure, diabetes, or high cholesterol (hyperlipidemia) are also present.
All available phentermine products — including Adipex-P, Lomaira, and various generic capsules and tablets — share this same FDA-approved use. Lomaira tablets are specifically dosed to be taken three times daily before meals, while other formulations are generally taken once daily. Treatment is intended to last only a few weeks.
Other Drugs & Vegetarian Diet
Browse every other medication we’ve checked against Vegetarian Diet — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
No interaction 2,829 drugs checked — show the list
We also checked Vegetarian Diet against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Warfarin ›
- Methylphenidate ›
- Sertraline ›
- Abemaciclib ›
- Ivermectin ›
- Testosterone ›
- Losartan Potassium ›
- Acetaminophen ›
- Aspirin ›
- Metoprolol ›
- Rosuvastatin ›
- Escitalopram ›
- Rivaroxaban ›
- Clopidogrel ›
- Atorvastatin ›
- Docusate ›
- Tirzepatide ›
- Methamphetamine ›
- Tadalafil ›
- Ibuprofen ›
- Warfarin Sodium ›
- Valacyclovir ›
- Hydroxyurea ›
- Sumatriptan ›
- Semaglutide ›
- Prednisone ›
- Amitriptyline ›
- Propranolol ›
- Lisdexamfetamine ›
- Metformin ›
- Amoxicillin ›
- Lisinopril ›
- Isotretinoin ›
- Methotrexate ›
- Amlodipine Besylate ›
- Bendamustine ›
- Amphetamine ›
- Bupropion ›
- Doxycycline ›
- Fluoxetine ›
- Azithromycin ›
- Acyclovir ›
- Pregabalin ›
- Lamotrigine ›
- Dextroamphetamine ›
- Gabapentin ›
- Levothyroxine, Liothyronine ›
- Acetaminophen, Codeine ›
- Naproxen ›
- Clonazepam ›
- Quetiapine ›
- Omeprazole ›
- Duloxetine ›
- Letrozole ›
- Citalopram ›
- Methylene Blue ›
- Buspirone ›
Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Vegetarian Diet list.
Vegetarian Diet References
The 11 references that drive our Vegetarian 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.
- Foster M, Herulah UN, Prasad A, Petocz P, Samman S. Zinc Status of Vegetarians during Pregnancy: A Systematic Review of Observational Studies and Meta-Analysis of Zinc Intake. Nutrients. 2015 Jun 5;7(6):4512-25. PubMed
- Ho-Pham LT, Nguyen ND, Nguyen TV. Effect of vegetarian diets on bone mineral density: a Bayesian meta-analysis. Am J Clin Nutr. 2009;90(4):943-50. PubMed
- Majchrzak D, Singer I, Männer M, et al. B-vitamin status and concentrations of homocysteine in Austrian omnivores, vegetarians and vegans. Ann Nutr Metab. 2006;50(6):485-91. PubMed
- Institute of Medicine (US) Panel on Micronutrients. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington (DC): National Academies Press (
- Crozier SR, Godfrey KM, Calder PC, et al. Vegetarian Diet during Pregnancy Is Not Associated with Poorer Cognitive Performance in Children at Age 6-7 Years. Nutrients. 2019;11(12):3029. PubMed
- Iguacel I, Miguel-Berges ML, Gómez-Bruton A, Moreno LA, Julián C. Veganism, vegetarianism, bone mineral density, and fracture risk: a systematic review and meta-analysis. Nutr Rev. 2019;77(1):1-18. PubMed
- Tan C, Zhao Y, Wang S. Is a vegetarian diet safe to follow during pregnancy? A systematic review and meta-analysis of observational studies. Crit Rev Food Sci Nutr. 2019;59(16):2586-2596. PubMed
- Yisahak SF, Hinkle SN, Mumford SL, et al. Vegetarian diets during pregnancy, and maternal and neonatal outcomes. Int J Epidemiol 2021;50(1):165-178. PubMed
- Avnon T, Paz Dubinsky E, Lavie I, Ben-Mayor Bashi T, Anbar R, Yogev Y. The impact of a vegan diet on pregnancy outcomes. J Perinatol 2021;41(5):1129-1133. PubMed
- Kesary Y, Avital K, Hiersch L. Maternal plant-based diet during gestation and pregnancy outcomes. Arch Gynecol Obstet 2020;302(4):887-898. PubMed
- Melina V, Craig W, Levin S. Position of the Academy of Nutrition and Dietetics: Vegetarian Diets. J Acad Nutr Diet. 2016;116(12):1970-1980. 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.
Following Vegetarian Diet While Taking Phentermine: Common Questions
Is it safe to follow Vegetarian Diet while taking Phentermine?
Are Vegetarian Diet and Phentermine used for the same thing?
Does Phentermine interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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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.