Lisinopril/hydrochlorothiazide (often written lisinopril/HCTZ) is a fixed‑dose combination medication used to treat high blood pressure.
What it is:
- Lisinopril: an ACE inhibitor that relaxes blood vessels.
- Hydrochlorothiazide (HCTZ): a thiazide diuretic that helps the body get rid of excess salt and water.
What it’s used for:
- Primarily to lower blood pressure. It may be chosen when lisinopril alone isn’t enough, or to simplify dosing.
How it works:
- Lowers blood pressure by combining RAAS relaxation (lisinopril) with diuresis (HCTZ).
Common considerations:
- Dosing: taken once daily (brand strengths vary). It’s usually taken in the morning due to the diuretic effect.
- Brand names include Zestoretic, Prinzide, Zestorectic, and other fixed-dose combos.
- Not for use in pregnancy (can harm the fetus). Stop if you become pregnant and contact your clinician.
Possible side effects:
- Common: dizziness, lightheadedness, cough (from lisinopril), increased urination (from HCTZ).
- Other: hyperkalemia (high potassium), low sodium, dehydration, fatigue.
- More rare but serious: angioedema (swelling of face/t throat), kidney function changes, severe low blood pressure, gout flares (HCTZ can raise uric acid).
Important safety and interactions:
- Avoid potassium supplements or salt substitutes high in potassium unless your doctor says OK.
- Caution with NSAIDs (e.g., ibuprofen) as they can reduce blood pressure effect and affect kidney function.
- Caution if you have kidney disease, a history of gout, or diabetes (HCTZ can affect glucose and uric acid).
- Tell your doctor about all meds you take (lithium, other BP meds, potassium-sparing drugs, diabetes meds).
What to monitor:
- Blood pressure regularly.
- Blood tests for electrolytes (potassium, sodium) and kidney function.
- Watch for signs of low BP (dizziness, fainting), signs of high potassium (irregular heartbeat, numbness/weakness), or gout symptoms.
If you were asking for something specific (e.g., how it compares to lisinopril alone, dosing questions, whether it’s right for you, or potential drug interactions with meds you’re taking), tell me more about your condition and any meds you’re on and I can tailor the info. If you have a prescription, follow your doctor’s instructions and never adjust the dose without medical advice.