You should not use  hydrochlorothiazide and olmesartan if you are unable to urinate.
Do not use if you are pregnant. Use effective birth control, and tell your doctor if you become pregnant during treatment.
If you have diabetes, do not use hydrochlorothiazide and olmesartan together with any medication that contains aliskiren (a blood pressure medicine).
Before taking this medicine
You should not use this medicine if you are allergic to hydrochlorothiazide or olmesartan, or if you are unable to urinate.
If you have diabetes, do not use hydrochlorothiazide and olmesartan together with any medication that contains aliskiren (a blood pressure medicine).
You may also need to avoid taking hydrochlorothiazide and olmesartan with aliskiren if you have kidney disease.
Tell your doctor if you have ever had:
kidney disease;
liver disease;
congestive heart failure;
glaucoma;
low or high levels of potassium in your blood;
asthma or allergies;
high cholesterol or triglyceride levels;
gout;
lupus;
diabetes; or
an allergy to penicillin or sulfa drugs.
Do not use if you are pregnant. Stop using the medicine and tell your doctor right away if you become pregnant. Olmesartan can cause injury or death to the unborn baby if you take the medicine during your second or third trimester.
You should not breastfeed while using this medicine.
How should I take hydrochlorothiazide and olmesartan?
Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.
Your blood pressure will need to be checked often.
Call your doctor if you have ongoing vomiting or diarrhea, or if you are sweating more than usual. You can easily become dehydrated while taking this medication, which can lead to severely low blood pressure or a serious electrolyte imbalance.
If you need surgery or medical tests, tell the surgeon ahead of time that you are using hydrochlorothiazide and olmesartan.
It may take up to 4 weeks for this medication to control your blood pressure. Keep using  hydrochlorothiazide and olmesartan as directed, even if you feel well. High blood pressure often has no symptoms. You may need to use blood pressure medication for the rest of your life.
Store at room temperature away from moisture and heat.
What happens if I miss a dose?
Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include fast or slow heart rate, feeling light-headed, or fainting.
