Brief Answer: You may use another blood pressure lowering drug instead of amlodipine. You should check your calcium level in blood. Detailed Answer: Hello, Thank you for using HCM. Calcium tablets is better not to be taken with amlodipine because they may interfere with each other and alter each other s potency.While amlodipine blocks calcium, calcium supplements increase the amount of calcium present in the body. This can cause calcium to be channeled incorrectly, which can reduce your overall blood pressure dramatically. Reduced blood pressure, or hypotension, will cause you to feel light headed and can cause you to faint. This effect is more prominent while taking iv calcium. As the calcium supplements are indispensable for you, you should discuss with your treating doctor to utilize another drug for lowering blood pressure. For example: calcium supplements don t appear to interact with other commonly prescribed blood pressure medications, such as: - Beta blockers bisoprolol (Zebeta), propranolol (Inderal, Innopran XL), etc - Angiotensin-converting enzyme (ACE) inhibitors, such as captopril (Capoten), lisinopril (Prinivil, Zestril), etc - Angiotensin II receptor blockers, such as losartan (Cozaar), valsartan (Diovan), etc - Renin inhibitors, such as aliskiren (Tekturna) Even though you should discuss this with your treating doctor. Meanwhile another check of the calcium levels in blood should be done. Hope this is helpful. Let me know if you need more clarifications. Otherwise please close and rate the answer. Kind Regards, Dr. Juarda