Collocations for side effect - noun

common
possible, potential
adverse, bad, dangerous, debilitating, deleterious (esp. AmE), harmful, nasty, negative, toxic, undesirable, unexpected, unfortunate, unpleasant, unwanted
deadly, fatal
major, serious, severe, significant
mild, minimal, minor
beneficial, positive
long-term
physical
drug
known, reported
This drug has no known side effects.

cause, have, produce
The treatment has some unfortunate side effects.

develop
experience, suffer
minimize, reduce

side effect from
The patient suffered severe side effects from the drug.

side effect of
The drug has the beneficial side effect of lowering the patient's blood pressure.

side effect on
The medication can have adverse side effects on the patient.