The most common side effects with Clopidogrel BMS (seen in between 1 and 10 patients in 100) are haematoma (a collection of blood under the skin), epistaxis (nosebleeds), gastrointestinal haemorrhage (bleeding in the stomach or gut), diarrhoea, abdominal (tummy) pain, dyspepsia (indigestion), bruising and bleeding where the skin is punctured.