Co-A2a 50/12.5mg Tablets is a medication used to treat high blood pressure. It contains two active ingredients, amlodipine (5mg) and olmesartan medoxomil (20mg), and is available as tablets. Amlodipine is a calcium channel blocker that works by relaxing the blood vessels, while olmesartan medoxomil is an angiotensin II receptor blocker that works by blocking the effects of a hormone called angiotensin II, which constricts blood vessels and increases blood pressure. This combination medication helps to lower blood pressure and improve blood flow. It is usually taken once a day, with or without food, as directed by a healthcare professional. Possible side effects may include dizziness, headache, swelling, and stomach upset. It is important to take this medication as prescribed and to follow up regularly with a healthcare provider to monitor blood pressure and any potential side effects.