Common side effects of Norvasc (amlodopine) include dizziness, headache, stomach cramps, sweating, bleeding gums, and upset stomach. Severe side effects include ankle or foot swelling, blood in urine, chest pain, confusion, an enlarged neck vein, hives, tar-like stool, racing heart, and yellow skin or eyes. If any of these symptoms are spotted, a healthcare provider should be notified immediately.