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round yellow pill with RX 537 on it ## The pill you have is Lisinopril (20 mg) + Hydrochlorothiazide (12.5 mg). These two drugs are respectively a combination of a diuretic and an ACE inhibitor, to control hypertension. You can view a detailed description of the drug, by clicking on the link below... If you have any more questions or comments to add, please post back so I can further assist you.

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