The most common side effects (seen in between 1 and 10 patients in 100) are reactions at the injection site, headache, somnolence (sleepiness), nausea (feeling sick), abdominal (tummy) pain, pelvic (lower abdominal) pain, ovarian hyperstimulation syndrome (e. g. feeling sick, weight gain, diarrhoea), ovarian cyst, and breast pain.