Compare hydrochlorothiazide vs. Inspra

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Microzide (hydrochlorothiazide)

Prescription only

Inspra (eplerenone)

Prescription only
Removes water from the body, which lowers blood pressure.

Microzide (hydrochlorothiazide (HCTZ)) is a well-tolerated water pill that's often the first-choice treatment for mild high blood pressure.

4.5/ 7 average rating with 139 reviewsforhydrochlorothiazide
Helps lower blood pressure and protect the heart in people with heart failure.

Inspra (eplerenone) lowers blood pressure and can help remove fluid when it's used with other drugs. It reduces the risk of death in people with heart failure and is usually used when people can't take spironolactone.

  • Does a good job getting rid of extra fluids in your body by making you urinate more.
  • A first-choice blood pressure treatment. Works especially well for people of African descent.
  • Lowers the risk of heart attack and stroke.
  • Good option if you have high blood pressure and heart failure.
  • Most people have very few side effects from Microzide (hydrochlorothiazide (HCTZ)).
  • Can be good for patients with osteoporosis since it raises the body's level of calcium.
  • Lowers your blood pressure.
  • It can help remove fluid from your body when it's used with other drugs.
  • Reduces the risk of death in people with heart failure.
  • It can have fewer side effects than spironolactone.
  • Makes you urinate more often.
  • Microzide (hydrochlorothiazide (HCTZ)) doesn't work well in people with severe kidney problems.
  • It can increase the risk of gout attacks in people with poor kidney function or a history of gout.
  • People with a sulfa allergy may be allergic to Microzide (hydrochlorothiazide (HCTZ)).
  • Inspra (eplerenone) isn't a first choice medicine for lowering blood pressure or getting rid of fluid in the body. It's usually used in combination with other medicines.
  • It can make you feel dizzy for the first few days. Be careful driving until you know how it affects you.
  • You'll need to have blood tests done regularly since Inspra (eplerenone) can affect your potassium levels and kidney function.
  • It can be very expensive compared to spironolactone.
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Side effects
The Microzide (hydrochlorothiazide (HCTZ)) FDA package insert doesn’t have numbers about how common side effects are.
2possible side effects
  • High potassium
  • Abnormal renal function
See more detailed side effects
Risks and warnings
  • Dehydration and electrolyte imbalance

    Current electrolyte imbalance

    ...and 2 more risk factors

  • Severe allergic reactions

    History of sulfa allergies

  • Gout

    History of gout

    ...and 1 more risk factors

  • Vision problems

    History of sulfa or penicillin allergies

  • Higher blood sugars


See more detailed risks and warnings
  • Low blood pressure

    Taking with alcohol

    ...and 1 more risk factors

  • Heart problems from high potassium

    Current kidney problems

    ...and 3 more risk factors

  • Kidney problems

    Current kidney problems

  • Liver problems

    Liver damage

See more detailed risks and warnings