Uncommon side effects Mood changes, angioedema (hypersensitivity reaction with sudden swelling of the lips, face and neck, and occasionally of the feet and hands; higher rate of angioedema in black patients than in non-black patients), change of colour (pale blue followed by redness) and/ or numbness or tingling in the fingers or toes (Raynaud’ s phenomenon), changes in the way things taste, fatigue, feeling sleepy or difficulty in going to sleep, strange dreams, rapid heartbeat, runny nose, nausea, stomach pain or indigestion, skin rash, itching, impotence, tiredness, muscle weakness).