The most common side effects with Mycamine (seen in between 1 and 10 patients in 100) are leucopenia (low levels of leucocytes, a type of white blood cell), neutropenia (low levels of neutrophils, a type of white blood cell), anaemia (low red blood cell counts), hypokalaemia (low blood potassium levels), hypomagnesaemia (low blood magnesium levels), hypocalcaemia (low blood calcium levels), headache, phlebitis (inflammation of a vein), nausea (feeling sick), vomiting, diarrhoea, abdominal (tummy) pain, signs of liver problems in the blood (increased levels of alkaline phosphatase, aspartate aminotransferase, alanine aminotransferase or bilirubin), rash, pyrexia (fever) and rigors (shaking chills).