Benicar, known generically as olmesartan, is a prescription drug used to treat high blood pressure. Benicar works by preventing the tightening of blood vessels that supply blood to the brain, heart and other organs. The side effects of Benicar are typically mild. Certain individuals may be prone to more serious complications of Benicar use. A physician should explain the potential side effects of Benicar before the start of Benicar treatment.
Dizziness
Drug safety information provided by the manufacturers of Benicar at Benicar.com explains that dizziness is one of the most common side effects of Benicar use. Dizziness and vertigo may affect up to 9 percent of Benicar users. These side effects are typically harmless and occur as the body adjusts to the drug. Patients that experience persistent or troublesome dizziness while taking Benicar should discuss such side effects with a physician.
Nausea
About 3 percent of people taking Benicar will experience nausea and vomiting as a side effect of Benicar use, according to Benicar.com. Nausea, vomiting and loss of appetite are mild side effects, and are not considered to be medically urgent unless they lead to more severe complications.
Diarrhea
Benicar can cause a number of mild side effects on the digestive system, leading to upset stomach and diarrhea. According to Drugs.com, about 1 percent of Benicar patients will experience gastrointestinal side effects such as diarrhea.
Respiratory Tract Infection
Benicar.com says that up to 7 percent of individuals taking Benicar may experience upper respiratory infections as a side effect of Benicar use. These infections typically manifest as a cough or cold.
Dehydration
Drugs.com explains that Benicar can adjust levels of electrolytes in the blood and lead to dehydration, particularly when Benicar is used in combination with a diuretic. Signs of dehydration in response to Benicar use include dry mouth, drowsiness, muscle cramps and decreased urination. These side effects can be serious and should be reported to a physician.
Kidney Failure
Drug safety information reproduced by Drugs.com warns that Benicar can have negative effects on the kidneys, and may cause kidney damage. Individuals who experience any pain in the kidney or abdominal region while taking Benicar should contact a physician. Other signs of kidney problems include changes in urinary output, changes in urine color, cloudy urine, or pain with urination.
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