The most common side effects with Alimta (seen in more than 1 patient in 10) are decreased levels of neutrophils or granulocytes and of leucocytes (types of white blood cell), decreased levels of haemoglobin (the protein found in red blood cells that carries oxygen around the body), diarrhoea, vomiting, stomatitis or pharyngitis (inflammation of the lining of the mouth or throat), nausea (feeling sick), anorexia (loss of appetite), fatigue (tiredness), and rash or desquamation (shedding of the upper layers of the skin).