Hi welcome to HealthcareMagic
Lisnopril is a ACE inhibitors, which is an AntiHypertensive... you must not stop the antihypertensives, it is life long treatment... also it will lead to sudden rise in BP ending up in other complications like stroke
, MI.... The headache is not due to lisinopril
.. continue it., also need to monitor you BP regular..
Hope I have answered your question..