Medicine Name: Myestin 60mg Tablet. Composition: Pyridostigmine (60mg). Side Effects: Nausea Excessive salivation Diarrhea Blurred vision Breathlessness Watery eyes Abdominal pain Altered frequency of urination Sweating Headache Dizziness Runny nose Heartburn Gastro esophageal reflux disease Paresthesia tingling or pricking sensation Muscle twitching Weakness Muscle cramp Increased bronchial secretions.