Didrex (Benzphetamine) is a sympathomimetic amine, which is similar to an amphetamine. Didrex stimulates the central nervous system (nerves and brain), which increases your heart rate and blood pressure and decreases your appetite. Didrex is used as a short-term supplement to diet and exercise and is considered a treatment of obesity. Benzphetamine (Didrex) is an FDA-approved drug.

Phentermine, Phendimetrazine, Diethylpropion, Benzphetamine, and Qsymia should NOT be used as a substitute for proper diet or exercise. For maximum effects, they must be used in conjunction with a reduced-calorie diet and/or exercise.

You should not use Benzphetamine if you have heart problems or heart disease, high blood pressure, hyperthyroidism, a history of drug abuse, or glaucoma. Benzphetamine can interact with several medications, so be sure to tell your doctor about all drugs you take. 

Benzphetamine should only be used under doctor supervision. 


Like all prescription appetite suppressants, there are common side effects. Benzphetamine side effects can include:

  • trouble sleeping
  • dizziness 
  • tremors
  • increased sweating
  • hyperactivity or restlessness
  • upset stomach, nausea, or constipation
  • dry mouth
  • blurred vision
  • headache
  • irritability

Your doctor can tell you about other potential side effects. Additionally, you should be aware of certain side effects that your doctor will want you to contact about, including changes in mood, heart fluttering or pounding, changes in urination, or increased blood pressure. 

Any modifications in your diet, activity level, and behavior must be developed and continued long-term in order to continue losing weight and prevent the lost weight from returning. Transformyou will help you stay on-track with your medical weight loss goals, checking in on you frequently regarding your general health, weight, etc. and adjusting your medical weight loss plan according to your needs. 

All patients always work directly with one of our licensed physicians to ensure patient safety and confidentiality.

The Controlled Substances Prescription Monitoring Program (CSPMP) is a program developed to promote the public health and welfare by detecting diversion, abuse and misuse of prescription medications classified as controlled substances under the Arizona Uniform Controlled Substances Act.  Every Physician who possesses a DEA registration is required to also possess a CSPMP registration issued by the Arizona Board of Pharmacy. At transformyou, we adhere to Arizona's CSPMP policy before prescribing a controlled substance to any patient.