The most common side effects with Efient (seen in between 1 and 10 patients in 100) are anaemia (low red blood cell counts), haematoma (a collection of blood under the skin or in a muscle), epistaxis (nosebleeds), gastrointestinal haemorrhage (bleeding in the stomach or gut), rash, haematuria (blood in the urine), bleeding from needle puncture sites, haematoma at puncture sites and bruising.