A 58-year-old female with a history of hypertension and osteoarthritis is being treated with the following medications:
Lisinopril 10 mg daily
Hydrochlorothiazide (HCTZ) 25 mg daily
Ibuprofen 400 mg TID for knee pain
She complains of worsening blood pressure readings, now averaging 150/92 mmHg.
What is the MOST likely reason for her uncontrolled blood pressure?
