I took this med for 3 years. It takes getting use to, or your body has to adjust to it. It is a potent vasodilator and opens up the arteries to the brain, heart and everything. The headache is from the increased blood flow.
It is timed released nitroglycerin. I stopped it so I could take viagra, with my doctors permission.
Ask for Topamax for the headaches. This med can affect your eyes in a bad way (known side effect). I had to stop taking it routinely but still take it on occasion. Good luck...
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