<s>[INST] I was taking 3-4 Zyrtec per day with nasal decongestant spray. I have hypertension could this increase my BP further. I have stopping taking these meds. But I do wonder could have affected my BP. MY BPreached 194/113 ,now on anti hypertensives med and my Bo is on its way down. Thank you. Nick [/INST] Hello, I would explain that Zyrtec does not usually cause high blood pressure as an adverse effect.  For this reason, I would recommend consulting with your attending physician for a physical exam and some tests in order to investigate the possible causes underlying high blood pressure values: - complete blood count, PCR, ESR for inflammation- thyroid hormone levels for thyroid gland dysfunction- blood electrolytes for possible imbalance-kidney and liver function tests-fasting glucose.  Hope I have answered your query. Let me know if I can assist you further.  </s>