Key takeaways
Candesartan (Atacand) and olmesartan (Benicar) are both angiotensin II receptor blockers (ARBs) used to treat high blood pressure. Candesartan is also used to lower the risk of worsening heart failure in adults, while olmesartan is not. Candesartan can be taken once or twice daily, whereas olmesartan is typically taken once a day. Both medications can be used in children, but the dosing varies based on age and weight. Candesartan may take 4-6 weeks to show full benefits, while olmesartan usually takes about 2 weeks. Common side effects of candesartan include upper respiratory tract infections, dizziness, and back pain, whereas olmesartan commonly causes dizziness. Olmesartan has a specific warning for severe diarrhea that can occur even months after starting the medication. Both medications should be avoided during pregnancy and can raise potassium levels.
