No, they are both single entity drugs from different classes and have different modes of action.
No unless it has been contaminated by the manufacturer. You may have a script that contains HCTZ, that is a form of potassium. I know because I'm allergic to potassium.
Both are different classes of drugs. Lisinopril is an ACE inhibitor whereas valsartan is an angiotensin II receptor antagonist. Both are used to treat hypertension.
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