Tadalafil and hydrochlorothiazide?

Short answer: Yes, tadalafil and hydrochlorothiazide can usually be used together. There isn’t a meaningful drug interaction between them.

What to know:
- Why you might need to watch out: Both drugs can lower blood pressure. Using them together can increase the chance of lightheadedness or dizziness, especially when you stand up quickly, are dehydrated, or are taking other blood pressure meds.
- Nitrates and alpha-blockers: Do not take tadalafil if you use nitrates (for chest pain) or certain alpha-blockers (e.g., doxazosin, tamsulosin) unless your doctor has given specific instructions. This is a more important interaction than with hydrochlorothiazide.
- Other meds and conditions: If you have kidney or liver problems, or take other medications that affect blood pressure, tell your doctor. They can adjust doses if needed.

Practical tips:
- Start with your usual tadalafil dose as prescribed, and continue your regular hydrochlorothiazide unless your clinician tells you otherwise.
- Monitor for symptoms: dizziness, fainting, unusually low blood pressure, or chest discomfort. If these occur, sit/lie down and seek medical advice.
- Avoid or limit alcohol, which can also lower blood pressure and worsen dizziness.
- If you’re on nitrates or certain other BP meds, or you’re planning to start any new drug, check with your clinician.

If you want, tell me your specific doses or any other meds you take, and I can tailor the guidance. And as always, discuss any new or ongoing meds with your prescribing clinician.