Hello dear user! I have gone through your query and understood your concerns! Thank you for sharing them on healthcaremagic. Well, just an extra dose might not cause problems with your blood pressure. It may affect slightly your bp, and lower it a little bit more, as in the time you were taking combined pill of lisinopril and Hctz. Just consider like you have taken your old pill you used to before. Take regularly the other pills and you will be good. I hope this answer was helpful to you! Please kindly rate it as helpful and write a short review about your experience with me! I would appreciate that a lot. Thank you and best regards! DR ERIOL.