The most common side effects with Aldurazyme in patients over the age of five (seen in more than 1 patient in 10) are headache, nausea (feeling sick), abdominal (tummy) pain, rash, arthropathy (damage to the joints), arthralgia (joint pain), back pain, pain in the extremities (hands and feet), flushing, pyrexia (fever) and reactions at the site of the infusion.