side effect noun
ADJ. adverse, dangerous, harmful, nasty, negative, serious, severe, toxic, undesirable, unexpected, unfortunate, unpleasant, unwanted | beneficial | long-term | physical
VERB + SIDE EFFECT cause, have, produce The treatment has some unfortunate side effects. | suffer
PREP. ~ from The patient suffered severe side effects from the drug. | ~ of The drug has the beneficial side effect of lowering the patient's blood pressure. | ~ on The medication can have adverse side effects on the patient.