<prompt> Most impoant side effect of aspirin ?GastritisEdemaKidney damageHypersensitivity  <response>: Ans. is a i.e., Gastritis Adverse effects of aspirin Side effects Occur at analgesic dose 0.3 - 1.5 mgday Symptoms are nausea, vomiting, epigastric distress, increased occult blood loss in stools. The most impoant adverse effect of aspirin is gastric mucosal damage. 