February 23, 2017
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Didrex

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Didrex




Didrex Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 01/05/2017

Didrex (benzphetamine) is a sympathomimetic amine, similar to an amphetamine, used as a short-term supplement to diet and exercise in the treatment of obesity. Didrex is available in generic form. Common side effects of Didrex include:

  • dizziness,
  • dry mouth,
  • difficulty sleeping (insomnia),
  • irritability,
  • nausea,
  • vomiting,
  • upset stomach,
  • diarrhea,
  • constipation,
  • restlessness,
  • hyperactivity,
  • headache,
  • tremors,
  • increased sweating,
  • dry mouth,
  • unpleasant taste in your mouth, or
  • skin rash.

Tell your doctor if you have unlikely but serious side effects of Didrex including:

  • fast/irregular/pounding heartbeat,
  • mental/mood changes (e.g., agitation, uncontrolled anger, hallucinations, nervousness),
  • uncontrolled muscle movements, or
  • changes in sexual ability or interest.

The suggested dosage of Didrex ranges from 25 to 50 mg one to three times daily. Dosage of Didrex should be individualized according to the response of the patient. Didrex may interact with ammonium chloride, ascorbic acid (vitamin C), K-Phos, blood pressure medications, insulin or oral diabetes medications, sodium bicarbonate, potassium citrate, sodium citrate and citric acid, sodium citrate and potassium, stimulants or ADHD medications, or antidepressants. Tell your doctor all medications and supplements you use. Do not use Didrex if you are pregnant; it can harm a fetus or cause birth defects. Tell your doctor right away if you become pregnant during treatment with Didrex. Use birth control while you are using Didrex. Didrex can pass into breast milk and may harm a nursing baby. Breastfeeding while taking Didrex is not recommended.

Our Didrex (benzphetamine) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Patient Information in Detail?

Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.

Didrex in Detail - Patient Information: Side Effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop taking benzphetamine and call your doctor at once if you have a serious side effect such as:

  • feeling short of breath, even with mild exertion;
  • chest pain, feeling like you might pass out;
  • swelling in your ankles or feet;
  • pounding heartbeats or fluttering in your chest;
  • confusion or irritability, unusual thoughts or behavior; or
  • dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats, seizure).

Less serious side effects may include:

  • feeling restless or hyperactive;
  • headache, dizziness, tremors;
  • sleep problems (insomnia);
  • increased sweating;
  • dry mouth or an unpleasant taste in your mouth;
  • nausea, diarrhea upset stomach; or
  • skin rash.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the entire detailed patient monograph for Didrex (Benzphetamine)

What is Patient Information Overview?

A concise overview of the drug for the patient or caregiver from First DataBank.

Didrex Overview - Patient Information: Side Effects

SIDE EFFECTS: Dizziness, dry mouth, difficulty sleeping, irritability, nausea, vomiting, diarrhea, or constipation may occur. If these effects persist or worsen, notify your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur: fast/irregular/pounding heartbeat, mental/mood changes (e.g., agitation, uncontrolled anger, hallucinations, nervousness), uncontrolled muscle movements, change in sexual ability/interest.

Stop taking this medication and seek immediate medical attention if any of these rare but very serious side effects occur: severe headache, slurred speech, seizure, weakness on one side of the body, vision changes (e.g., blurred vision).

This drug may infrequently cause serious (sometimes fatal) lung or heart problems (pulmonary hypertension, heart valve problems). The risk increases with longer use of this medication and use of this drug along with other appetite-suppressant drugs/herbal products. If you notice any of the following unlikely but very serious side effects, stop taking this medication and consult your doctor or pharmacist immediately: chest pain, difficulty breathing with exercise, decreased ability to exercise, fainting, swelling of the legs/ankles/feet.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any of the following symptoms of a serious allergic reaction: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Read the entire patient information overview for Didrex (Benzphetamine)

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Didrex FDA Prescribing Information: Side Effects
(Adverse Reactions)

SIDE EFFECTS

The following have been associated with the use of benzphetamine hydrochloride:

Cardiovascular

Palpitation, tachycardia, elevation of blood pressure.

There have been isolated reports of cardiomyopathy and ischemic cardiac events associated with chronic amphetamine use.

Valvular heart disease associated with the use of some anorectic agents such as fenfluramine and dexfenfluramine, both independently and especially when used in combination with other anorectic drugs, have been reported. However, no cases of this valvulopathy have been reported when DIDREX Tablets have been used alone.

CNS

Overstimulation, restlessness, dizziness, insomnia, tremor, sweating, headache; rarely, psychotic episodes at recommended doses; depression following withdrawal of the drug.

Gastrointestinal

Dryness of the mouth, unpleasant taste, nausea, diarrhea, other gastrointestinal disturbances.

Allergic

Urticaria and other allergic reactions involving the skin.

Endocrine

Changes in libido.

Read the entire FDA prescribing information for Didrex (Benzphetamine)

Didrex - User Reviews

Didrex User Reviews

Now you can gain knowledge and insight about a drug treatment with Patient Discussions.

Here is a collection of user reviews for the medication Didrex sorted by most helpful. Patient Discussions FAQs

Report Problems to the Food and Drug Administration

 

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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