Dizziness

• Dizziness and headaches are common side effects of phendimetrazine that may cause difficulty with driving and physical activity.
  
  

Insomnia

• Difficulty with falling asleep, staying asleep or waking up too early are side effects of phendimetrazine that can be avoided by not taking it at bedtime.
  
  

Mood Changes

• Feeling nervous, anxious and restless are side effects that may require medical evaluation if they persist or worsen.
  
  

Digestive

• Dryness or a sour taste in your mouth, diarrhea or constipation are digestive side effects of phendimetrazine.
  
  

Neurological

• Serious neurological side effects such as hallucinations, unusual behavior or sudden confusion require urgent medical treatment.
  
  

Blood Pressure

• Phendimetrazine may cause a life-threatening increase in your blood pressure, which includes symptoms such as severe headache, blurry vision, agitation and chest pain, and requires emergency treatment.
  
  

Addiction

• Phendimetrazine is an addictive drug and if suddenly stopped may cause physical and mental symptoms of withdrawal.