high blood pressure
"I used lisinopril for about 10 years for hypertension secondary to polycystic kidney disease.  Most of that time I spent at a 20mg dose and had an occasional dry cough, usually at night.  However, it controlled my blood pressure well for most of that time and the cough wasn't persistent.  We recently increased my dose to 30mg and I immediately developed a severe and persistent dry cough.  It was so bad that I was taking two doses of Nyquil a night (once at bedtime, once ~4am) to subdue the cough and get to sleep.  So, we discontinued the lisinopril."