text: Common effects (1–10% incidence) include: 
  * Abnormal dreams
  * Anisocoria
  * Anorgasmia
  * Anxiety
  * Arthralgia (joint pain)
  * Constipation
  * Decreased or increased appetite
  * Diarrhea
  * Dilated pupils
  * Dizziness
  * Dry mouth
  * Excessive sweating
  * Fatigue
  * Impotence (erectile dysfunction)
  * Libido changes
  * Myalgia (muscular aches and pains)
  * Paraesthesia (abnormal skin sensation)
  * Pyrexia (fever)
  * Restlessness
  * Sinusitis (nasal congestion)
  * Tremor
  * Vomiting
  * Yawning