Olmesartan Hydrochlorothiazide (Benicar HCT) Side Effects

Possible side effects of olmesartan hydrochlorothiazide are listed below. Call your doctor for medical advice if they are severe or persist after a few days.

• Nausea
• Dizziness
• Headache 

Some of the adverse effects of olmesartan hydrochlorothiazide are more serious. Call your doctor right away or seek emergency medical attention if you develop the following symptoms:

• Skin rash, hives, itching, blistering, peeling (signs of an allergic reaction)
• Swelling of the eyes, face, lips, mouth, throat, hands, lower legs, ankles, or feet
• Chest pain
• Difficulty breathing or swallowing
• Hoarseness
• Severe diarrhea
• Signs of dehydration (fluid or electrolyte imbalance), such as excessive thirst, dry mouth, nausea, vomiting, drowsiness, muscle pain, muscle weakness, muscle cramps, unusual tiredness, restlessness, confusion, fast heartbeat
• Signs of infection (fever, chills, sore throat, cough)
• Unusual bleeding or bruising
• Joint pain or joint swelling
• Stomach pain that spreads to the back
• Eye pain, swelling, or changes in vision

The above list may not include all the potential side effects of olmesartan hydrochlorothiazide. Contact your healthcare provider if your side effects are unusual or severe or they do not get better over time. You can also report suspected adverse reactions to the Food and Drug Administration at 1-800-FDA-1088.

Olmesartan hydrochlorothiazide (Benicar HCT) Overdose: In case of an overdose of olmesartan hydrochlorothiazide, call your doctor immediately. You can also call your local poison control center or the national poison control center at 1-800-222-1222. If a person has trouble breathing, has collapsed, is unresponsive, or has had a seizure, call 911 or emergency medical services.

Source: FDA