What is Adipex-P: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

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Adipex-P overview

BRAND NAMES:

  • Adipex-P, Lomaira

Generic Names:

  • Phentermine Hcl

Uses:

  • Helps you lose weight when used for a short time.

Therapeutic Classes:

  • Appetite Suppressant, Centrally Acting

Forms:

  • Dissolving Tablet, Capsule, Long Acting Capsule, Tablet, Dissolving Tablet

How it’s taken:

  • By mouth

What is Adipex-P used for?

Phentermine HCL is a medication used as an appetite suppressant. Phentermine HCL belongs to a class of medications called psychostimulants. Phentermine HCL has pharmacologic characteristics similar to amphetamines. Phentermine HCL is a generic medication also available under the brand names Adipex-P and Suprenza. As an appetite suppressant, phentermine HCL first became available in the 1970s.

What form(s) does Adipex-P come in

  • Dissolving Tablet

  • Capsule

  • Long Acting Capsule

  • Tablet

  • Dissolving Tablet

What are common Adipex-P doses?

  • Tablet 37.5MG

  • Capsule 37.5MG

Common Adipex-P prescriptions

  • Adipex-P
    30 tablets bottle

  • Adipex-P
    37.5mg capsule

  • Adipex-P
    37.5mg tablet

How to take Adipex-P

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • This medicine is not for long-term use.

  • To avoid trouble sleeping, always take this medicine in the morning and never at bedtime or late in the evening. Take the capsule 2 hours after breakfast.Take the extended-release capsule before breakfast.Take the disintegrating tablet in the morning, with or without food.Take the phentermine tablet before breakfast or 1 to 2 hours after breakfast.Take Lomaira„¢ tablet 30 minutes before meals.

  • Swallow the extended-release capsule whole. Do not crush, break, or chew it.

  • If you are using the disintegrating tablet, make sure your hands are dry before you handle the tablet. Place the tablet on your tongue. It should melt quickly. After the tablet has melted, swallow or take a drink of water.

  • Tablet: Swallow whole. Do not crush, break, or chew it.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Oral routeCarefully follow your doctor's instructions about any special diet.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • This medicine is not for long-term use.

  • If you are using the disintegrating tablet, make sure your hands are dry before you handle the tablet. Place the tablet on your tongue. It should melt quickly. After the tablet has melted, swallow or take a drink of water.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • To avoid trouble sleeping, always take this medicine in the morning and never at bedtime or late in the evening. Take the capsule 2 hours after breakfast.Take the extended-release capsule before breakfast.Take the disintegrating tablet in the morning, with or without food.Take the phentermine tablet before breakfast or 1 to 2 hours after breakfast.Take Lomaira„¢ tablet 30 minutes before meals.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • Tablet: Swallow whole. Do not crush, break, or chew it.

  • Swallow the extended-release capsule whole. Do not crush, break, or chew it.

  • Oral routeCarefully follow your doctor's instructions about any special diet.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

What to do if you miss a dose of Adipex-P

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • Oral routeAsk your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Adipex-P contraindications

  • This medicine is not right for everyone. Do not use it if you had an allergic reaction to phentermine or similar medicines, or if you are pregnant.

Adipex-P warnings

  • Your doctor will check your progress and the effects of this medicine at regular visits. Keep all appointments.

  • It is not safe to take this medicine during pregnancy. It could harm an unborn baby. Tell your doctor right away if you become pregnant.

  • Tell your doctor if you are breastfeeding, or if you have kidney disease, diabetes, glaucoma, congestive heart failure, heart or blood vessel disease, high blood pressure, overactive thyroid, or a history of stroke or drug abuse. Tell your doctor if have allergies to aspirin or tartrazine.

  • This medicine may cause the following problems:Primary pulmonary hypertension (a serious lung problem)Heart valve diseaseChanges in blood sugar levels

  • This medicine may make you dizzy or drowsy. Do not drive or do anything else that could be dangerous until you know how this medicine affects you.

  • This medicine can be habit-forming. Do not use more than your prescribed dose. Call your doctor if you think your medicine is not working.

  • Do not stop using this medicine suddenly. Your doctor will need to slowly decrease your dose before you stop it completely.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Adipex-P interactions

  • Do not use this medicine and an MAO inhibitor (MAOI) within 14 days of each other.

  • Some medicines can affect how phentermine works. Tell your doctor if you are using any of the following:Amphetamine medicine (including dextroamphetamine, methamphetamine)Diet pillsInsulin or diabetes medicineMedicine to treat depression (including fluoxetine, fluvoxamine, paroxetine, sertraline)

  • Do not drink alcohol while you are using this medicine.

  • This medicine can be habit-forming. Do not use more than your prescribed dose. Call your doctor if you think your medicine is not working.

  • Do not stop using this medicine suddenly. Your doctor will need to slowly decrease your dose before you stop it completely.

  • This medicine may make you dizzy or drowsy. Do not drive, use machines, or do anything else that could be dangerous until you know how this medicine affects you.

  • This medicine may affect blood sugar levels in patients with diabetes. Check with your doctor if you have any questions.

Adipex-P side effects

Serious Side Effects

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Chest pain, fainting, trouble breathing

  • Fast, slow, pounding, or uneven heartbeat

  • Seizures or tremors

  • Severe headache

  • Swelling of your feet or lower legs

Less Serious Side Effects

  • Dry mouth or a bad taste in your mouth

  • Nausea, vomiting, diarrhea, constipation, stomach cramps

  • Changes in sex drive

  • Dizziness, drowsiness, mild headache

  • Restlessness or nervousness, trouble sleeping

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