<s>[INST] hi i am 47year old woman and recently been diagnosed with coronary artery spasm, the cardiologist has put me on tildiem channel blocker, and to take a nitrate, half a tablet every day, i have only took them for 6 days and my side effects are horrendous, the pain in my head, and chest throughout the dat, mainly my head, i have tried to go to work but by three pm i am in agony with the worst headache, can you help and explain why these symptoms are arising and the background to coronary artery spam thank you [/INST] Hello dear, thanks for posting your query here. There could be many reasons for the headache but in your case, most likely it could be Chat Doctor. Nitrates very commonly cause headache, but it usually goes away after 2 to 3 weeks if person continues to take it by tachyphylaxis. But if you stop taking nitrates and then after few days again start taking it, you again will have headache. So continue taking your dose of nitrates. But I would advise you to see your doctor if that doesn't get relieved after another a week or 2. I hope this helps you. Thanks and all the best. </s>