95 • Tremor. • Muscle stiffness or spasm (including eye movements). • Problems with speech. • Unusual movement (especially of the face or tongue). • Constipation. • Dry mouth. • Rash. • Loss of strength. • Extreme tiredness. • Water retention leading to swelling of the hands, ankles or feet. • In the early stages of treatment, some people may feel dizzy or faint (with a slow heart rate), especially when getting up from a lying or sitting position.