Most people tolerate
hydrochlorothiazide (
HCTZ) well and do not appear to experience any side effects or problems while taking it. However, there are some potential dangers with hydrochlorothiazide that you should be aware of before starting the medication.
Hydrochlorothiazide may cause extreme low
blood pressure in some people. This risk is higher in people who are on dialysis, have
congestive heart failure, have
diarrhea or vomiting, or sweat a lot. Seek medical attention immediately if you experience dizziness, lightheadedness, or fainting (as these are possible symptoms of low blood pressure). If you have fainted, stop taking hydrochlorothiazide until you have talked to your healthcare provider.
Other potentially dangerous side effects of hydrochlorothiazide that should be reported to a healthcare provider immediately include:
- Unexplained swelling of the head or neck (including the face, lips, tongue, or throat)
- Unexplained skin rash
- Difficulty breathing or swallowing
- Decrease in the amount of urine produced.
