Can Adipex Make You Sleepy?


Adipex is a brand name for the prescription drug phentermine. It is an appetite-suppressant that is typically used in conjunction with diet and exercise for the treatment of obesity. As with most prescription drugs, there are significant side effects to Adipex that patients should be aware of, include effects on sleep patterns.


  • Adipex is a potent stimulant and appetite-suppressant that is similar in nature to amphetamines. It is habit-forming and known as a recreational drug of abuse, so care should be taken to ensure your prescription is safeguarded. Adipex should be taken exactly as prescribed, for only as long as prescribed and only in the amount prescribed. This medication is not intended for long-term use and should be discontinued after a few weeks.


  • Long-term exposure to high doses of Adipex can have serious repercussions including changes in personality, hyperactivity, skin problems, irritability and insomnia. This medication should not be taken within 10 hours of bed time. In order to prevent problems with sleeping, it is typically recommended to take this medication with water before breakfast.


  • Adipex does not cause drowsiness, but it can cause cloudy thinking and impair the patient's ability react quickly to changing situations. It is possible for patients to be wide awake yet unable to react appropriately because of there impaired mental state. It is, therefore, recommended that patients taking this medication should refrain from operating machinery, driving or participating in any other activity that requires mental alertness. Drinking alcohol while taking Adipex is not recommended as this may increase the potential side effects of this drug.


  • Extreme tiredness is a characteristic withdrawal symptom in long-term patients. Patients should not quit taking this drug suddenly without first consulting a qualified physician. This drug may required graduated weaning until the medication is completely out of the patient's system.

Side Effects

  • Some patients may exhibit allergic reactions to Adipex including swelling of the face or lips, difficulty breathing or hives. Allergic reactions may also include chest pain, uneven heartbeat, light-headedness, confusion, high blood pressure or feelings of confusion. These side effects may require emergency-medical treatment. Less serious side effects may include headache, tremors, insomnia, nervousness, dry mouth, anxiety or itching. If any of these symptoms become overbearing, the patient should consult with his or her physician.

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