Allergic reaction in the eye, cataract, darkening of the eyelashes, darkening of the iris colour, dizziness, high blood pressure, an increase in blood test results that show how your liver is working, cold, effects on the heart beat, heart failure, increased heart rate, low blood pressure, skin rash, cough, dry mouth, hair loss, nightmares, reduced sexual urge, memory loss, tiredness, ringing in the ears and a worsening of myasthenia gravis (increased muscle weakness).