Mrs. BL is 81 yo F admitted to hospital due to an allergicreaction. The physician has ordered these followingmedications:

Ranitidine 50 mg IV Q8H
Diphenhydramine 25mg PO TID (3 x daily)
Hydralazine 10 mg IV Q4H

Labs:
Ht: 5’5”,             Wt: 200 lb ,        SCr: 2.2mg/dL

What the correct dosage of ranitidine for this patient?

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