Hi it is quite normal to get headaches from this medication, and as you say they can be very severe. It is important that you don't stop taking the meds as this could make it worse. The medication will affect your blood pressure, hence the headaches. I was taking adalat, which work in the same way.
They will get better, hopefully very soon when your bp stabilises. You can take pain relief to help the pain, but you should check with your dr which pain killers are safe for you
Nitrates and nitrites dilate arteries and veins to lower the B.P. and decrease stress on heart. Throbbing temporal headache is a common problem. Orthostatic hypotension may be another problem.
But this medication is very very helpful esp if you suffer from angina or have plaque in your coronary arteries and doctor must be consulted b4 discontinuing the medication.
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