Common side effects, seen in more than 1 in 100 patients but less than 1in 10, include apathia muscle cramps, tiredness, a general feeling of being unwell or weakness, headache, sleepiness, problems with focussing your eyes, palpitations, chest pain, giddiness, dizziness, swelling, faintness or dizziness when standing up from a sitting or lying position (orthostatic dysregulation), shortness of breath, runny nose (rhinitis), constipation, indigestion, an increased desire or need to urinate and delayed ejaculation weakness (asthenia).