However, it has repeatedly shown to significantly increase weight loss in individuals in clinical trials. Adipex-P is most often taken orally one hour before or one to two hours after a healthy breakfast with the extended release form of this medication. This can vary, however, according to each individual, and your doctor may even prescribe three smaller doses each day. It is often recommended that the dose is taken at least 10-14 hours before bedtime, due to the amphetamine chemical makeup of this drug. There is also a form that is dissolved in the mouth rather than swallowed as a pill. It is very important to consult with your doctor about current and previous medical conditions and any side effects that you may be experiencing. Your doctor will adjust your prescription dosage according to your individual needs.
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Although rare, there are several side effects that may come along with use of Adipex-P. It is always very important to keep in communication with your doctor and/or pharmacist as new side effects arise or if they persist or become increasingly noticeable. As with any medication, your doctor is prescribing this medication with the belief that the benefits of the drug outweigh the risks due to side effects. At the same time, most people who take Adipex-P do not experience serious side effects and are able to take the medication as directed by their physician. When taking this medication, it is important to have your blood pressure checked often as well as to check it at home. You can purchase a sphygmomanometer (blood pressure monitor) online or from your local drug store. The most common side effects of Adipex-P are as follows:
  1. Dizziness
  2. Dry mouth
  3. Difficulty sleeping
  4. Irritability
  5. Nausea
  6. Vomiting
  7. Diarrhea or constipation
  8. Raised/high blood pressure
The following side effects are more severe and a doctor should be contacted/seen immediately if you or anyone you know taking Adipex-X experiences the following:
  1. Fast heartbeat, irregular heartbeat, pounding heartbeat
  2. Psychological and/or mood changes such as agitation, anger, hallucinations, nervousness
  3. Uncontrolled muscle movements
  4. Change in sexual interest and/or ability
Like the above side effects, a doctor should be notified immediately, but Adipex-P use should be immediately stopped with the following severe side effects:​​
  1. Severe headache/migraine
  2. Slurred speech
  3. Seizure
  4. Weakness on one side of the body
  5. Vision changes especially blurred vision
​Adipex-P can also rarely cause severe and even fatal heart and/or lung problems. This is, however, more likely with high dosage or longer use combined with other appetite suppressants (medications, supplements, and herbal appetite suppressants). Again, discontinue use and consult your physician immediately if you experience chest pain, difficulty breathing during exercise, decreased ability to exercise, fainting, and/or swelling of the legs, ankles, or feet. A very small number of individuals may experience an allergic reaction to this medication. Side effects of an allergic reaction include rash, itching and/or swelling of the face, tongue, or throat, severe dizziness, and/or trouble breathing. It is very important to monitor your biological processes when taking any medication, take note of potential side effects, and notify your doctor of any of these symptoms.