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Drugs reference index «Didrex»



Generic Name: Benzphetamine (benz-FET-ah-meen)Brand Name: Didrex

Didrex is used for:

Short-term management of obesity, as part of a weight-loss plan including a reduced-calorie diet. It may also be used for other conditions as determined by your doctor.

Didrex is an anorectic. It is not known exactly how Didrex works. It may work in part by acting on the appetite center in the brain to cause a temporary reduction in hunger or craving for food.

Do NOT use Didrex if:

  • you are allergic to any ingredient in Didrex
  • you have had a bad reaction to a sympathomimetic amine (eg, pseudoephedrine)
  • you are in an agitated state
  • you are pregnant or may become pregnant
  • you have glaucoma, an overactive thyroid, moderate to severe or uncontrolled high blood pressure, severe narrowing of the arteries, heart problems, or a history of alcohol or other substance abuse
  • you are taking furazolidone, guanadrel, or guanethidine, or you have taken a monoamine oxidase (MAO) inhibitor (eg, phenelzine) in the past 14 days
  • you are taking another stimulant (eg, amphetamine)

Contact your doctor or health care provider right away if any of these apply to you.

Before using Didrex :

Some medical conditions may interact with Didrex . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:

  • if you are pregnant, planning to become pregnant, or are breast-feeding
  • if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
  • if you have allergies to medicines, foods, or other substances
  • if you have high blood pressure

Some MEDICINES MAY INTERACT with Didrex . Tell your health care provider if you are taking any other medicines, especially any of the following:

  • Furazolidone or MAO inhibitors (eg, phenelzine) because side effects, such as headache, elevated body temperature, or severe high blood pressure, may occur
  • Selective serotonin reuptake inhibitors (SSRIs) (eg, fluoxetine) because the risk of side effects, such as mental or mood changes, may be increased
  • Urinary acidifiers (eg, ascorbic acid) because effectiveness of Didrex may be decreased
  • Stimulants (eg, amphetamine) or urinary alkalinizers (eg, sodium bicarbonate) because the actions and side effects of Didrex may be increased
  • Tricyclic antidepressants (eg, amitriptyline) because actions and side effects may be increased by Didrex
  • Guanadrel, guanethidine, or other high blood pressure medicines because effectiveness may be decreased by Didrex

This may not be a complete list of all interactions that may occur. Ask your health care provider if Didrex may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine.

How to use Didrex :

Use Didrex as directed by your doctor. Check the label on the medicine for exact dosing instructions.

  • Didrex may be taken with or without food.
  • If you miss a dose of Didrex , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Ask your health care provider any questions you may have about how to use Didrex .

Important safety information:

  • Didrex may cause drowsiness or dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to Didrex . Using Didrex alone, with certain other medicines, or with alcohol may lessen your ability to drive or perform other potentially dangerous tasks.
  • Do not exceed the recommended dose or take Didrex for longer than prescribed without checking with your doctor. Exceeding the recommended dose or taking Didrex for longer than prescribed may cause serious side effects.
  • Do not stop taking Didrex suddenly without first talking with your doctor.
  • Do not use Didrex for any reason or condition other than the one for which it was prescribed.
  • Didrex may cause sleeplessness. If you have trouble sleeping, you may need to take Didrex earlier in the day. Talk to your doctor before adjusting your dose of Didrex .
  • Diabetes patients - Didrex may affect your blood sugar. Check blood sugar levels closely and ask your doctor before adjusting the dose of your diabetes medicine.
  • Use of Didrex is not recommended in CHILDREN younger than 12 years of age. Safety and effectiveness in this age group have not been confirmed.
  • PREGNANCY and BREAST-FEEDING: Do not use Didrex if you are pregnant. If you suspect that you could be pregnant, contact your doctor immediately. Didrex is excreted in breast milk. Do not breast-feed while taking Didrex .

When used for long periods of time or at high doses, some people develop a need to continue taking Didrex . This is known as DEPENDENCE or addiction. When used for long periods of time or at high doses, Didrex may not work as well and may require higher doses to obtain the same effect as when originally taken. This is known as TOLERANCE. Talk with your doctor if Didrex stops working well. Do not take more than prescribed.

If you suddenly stop taking Didrex , you may experience WITHDRAWAL symptoms, such as extreme fatigue, mental depression, or sleep changes.

Possible side effects of Didrex :

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Changes in sex drive; diarrhea; dizziness; dry mouth; headache; nausea; restlessness; sleeplessness; tremor; unpleasant taste.

Seek medical attention right away if any of these SEVERE side effects occur:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); fast or irregular heartbeat; mental or mood changes; pounding in the chest; severe dizziness; severe excitability.

This is not a complete list of all side effects that may occur. If you have questions about side effects, contact your health care provider. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.

If OVERDOSE is suspected:

Contact 1-800-222-1222 (the American Association of Poison Control Centers), your local poison control center (http://www.aapcc.org), or emergency room immediately. Symptoms may include confusion; depression; high fever; irregular heartbeat; loss of consciousness; panic; rapid breathing; restlessness; seizures; severe nausea or diarrhea; severe tiredness; stomach cramps; tremor; vomiting.

Proper storage of Didrex :

Store Didrex at room temperature, between 68 and 77 degrees F (20 and 25 degrees C). Store away from heat, light, and moisture. Do not store in the bathroom. Keep Didrex out of the reach of children and away from pets.

General information:

  • If you have any questions about Didrex , please talk with your doctor, pharmacist, or other health care provider.
  • Didrex is to be used only by the patient for whom it is prescribed. Do not share it with other people.
  • If your symptoms do not improve or if they become worse, check with your doctor.

This information is a summary only. It does not contain all information about Didrex . If you have questions about the medicine you are taking or would like more information, check with your doctor, pharmacist, or other health care provider.

  • Didrex Prescribing Information (FDA)
  • Didrex Advanced Consumer (Micromedex) - Includes Dosage Information
  • Didrex Consumer Overview
  • Benzphetamine Prescribing Information (FDA)

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