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Didrex

Generic Name: benzphetamine (benz FET ah meen)
Brand Names: Didrex, Regimex
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Drug Information:
Didrex (benzphetamine) is a stimulant that is similar to an amphetamine. Benzphetamine is an appetite suppressant that affects the central nervous system. Didrex is used together with diet and exercise to treat obesity (overweight). Didrex may also be used for purposes not listed in this medication guide. Didrex can harm an unborn baby or cause birth defects. Do not use this medicine if you are pregnant. Do not use Didrex if you have used an MAO inhibitor in the past 14 days. A dangerous drug interaction could occur. MAO inhibitors include isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, tranylcypromine, and others. Learn more

Didrex Side Effects

Didrex Side Effects

Note: This document contains side effect information about benzphetamine. Some of the dosage forms listed on this page may not apply to the brand name Didrex.

For the Consumer

Applies to benzphetamine: oral tablet

Along with its needed effects, benzphetamine (the active ingredient contained in Didrex) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking benzphetamine:

More common

  • Agitation
  • anxiety
  • confusion
  • convulsions (seizures)
  • dizziness
  • fast, irregular, pounding, or racing heartbeat or pulse
  • feeling lightheaded or faint
  • hallucinations
  • headache
  • hives or welts
  • irritability
  • itching
  • lightheadedness
  • mood or other mental changes
  • nervousness
  • nightmares
  • numbness or tingling in the arms or legs
  • redness of skin
  • restlessness
  • shakiness in the legs, arms, hands, or feet
  • skin rash
  • sleeplessness
  • sweating
  • trembling of the hands or feet
  • trouble with sleeping
  • trouble with thinking, speaking, or walking
  • unable to sleep
  • unusual feeling of excitement
  • weakness

Rare

  • Chest discomfort or pain
  • difficulty breathing
  • discouragement
  • feeling sad or empty
  • lack of appetite
  • loss of interest or pleasure
  • severe mental changes
  • shortness of breath
  • swelling of the feet or lower legs
  • trouble with concentrating
  • trouble with breathing
  • unusual tiredness or weakness

Get emergency help immediately if any of the following symptoms of overdose occur while taking benzphetamine:

Symptoms of overdose

  • Blurred vision
  • change in consciousness
  • dark-colored urine
  • diarrhea
  • dizziness, faintness, or lightheadedness when getting up from a lying or sitting position suddenly
  • fever
  • loss of consciousness
  • muscle cramps or spasms
  • muscle pain or stiffness
  • nausea
  • nervousness
  • physical attempt to injure oneself
  • pounding in the ears
  • rapid, shallow breathing
  • severe anxiety or feeling of panic
  • stomach cramps
  • violent actions
  • vomiting

Some side effects of benzphetamine may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Decrease in sexual ability, desire, drive, or performance
  • decreased interest in sexual intercourse
  • dry mouth
  • inability to have or keep an erection
  • increase in sexual ability, desire, drive, or performance
  • increased interest in sexual intercourse
  • unpleasant taste

For Healthcare Professionals

Applies to benzphetamine: oral tablet

Cardiovascular

Frequency not reported: Palpitation, tachycardia, elevated blood pressure, cardiomyopathy, ischemic cardiac events with chronic amphetamine use

Nervous system

Frequency not reported: Overstimulation, restlessness, dizziness, tremor, sweating, headache

Psychiatric

Frequency not reported: Insomnia, psychotic episodes, depression following drug withdrawal

Endocrine

Frequency not reported: Libido changes

Gastrointestinal

Frequency not reported: Dry mouth, unpleasant taste, nausea, diarrhea, other GI disturbances

Hypersensitivity

Frequency not reported: Urticaria, other allergic skin reactions

Editorial References and Review

Medically reviewed by BestRx Medical Team Last updated on 1/1/2020.

Source: Drugs.com Didrex