The most common side effects with Temodal (seen in more than 1 patient in 10) are nausea (feeling sick), vomiting, constipation, anorexia (loss of appetite), alopecia (hair loss), headache, fatigue (tiredness), convulsions (fits), rash, neutropenia or lymphopenia (low white blood cell counts), and thrombocytopenia (low blood platelet counts).