I have a boyfriend who was diagnosed with high blood pressure yes...

I have a boyfriend who was diagnosed with high blood pressure yesterday March 25th. Prior to this about 3 years ago had a stroke, and a second small one. The doctor prescribed Lisinopril, after the first dose taken, he seems totally different. Seems to have a lack of attention on anything, a non caring attitude, very tired and starting to get the cough that is described in these side effects. I'm concerned about him. I'm worried about his high blood pressure that could result in another possible stroke but now I'm concerned he seems totally out of it while on this drug. Are there any other blood pressure meds that seem to get less side effects. The drug may resolve one thing but may cause many other things to go wrong. I don't know which is better for him. Taking this particular drug because it is cheaper to prevent the problem of high blood pressure, and possibly have something else go wrong with all the side effects. Or, stop the drug and find another with less side effects. What is the best solution. All drugs have side effects. When one thing is trying to be cured, the side effects could cause something else to go wrong. How does anyone know what is right.