Hi,
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Since you have pre-existing medical condition of hypertension, you should consider getting a thorough evaluation done by your gynecologist to rule out any other problems before you get started on the hormonal birth control use. Your gynecologist is the best to suggest you various birth control options (based on examination and evaluation findings). Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any unusual/abnormal/new symptoms immediately. Take adequate rest. Drink plenty of water. Maintain healthy diet and lifestyle.
Take care.