Phentermine FAQs

As with all medications people who take phentermine may suffer some side effects.

Common phentermine side effects include:

• Dry mouth
• Unpleasant taste in mouth
• Constipation
• Diarrhea
• Headaches
• Increased energy
• Restlessness
• Troubles sleeping
• Irritability
• Tiredness
• Feelings of nervousness
• Impotence
• Increase or decrease in libido
  

Less common side effects of Phentermine include:

• Blurred vision
• Dizziness
• Confusion
• Irregular heartbeat
• Stomach pain
• Nausea
• Feelings of depression

Other possible side effects of phentermine may be more serious. If you experience any of the following contact your doctor immediately:

• Suspected allergic reaction (skin rash, itching, facial swelling, short breaths, tight chest)
  
• Difficulty breathing
• Swelling of the mouth, legs or feet
• Racing heart beat
• Fainting
• Chest pains
• Uncharacteristic behavior
• Psychosis