This blue, oval pill imprinted with F 82 is a valacyclovir (as valacyclovir hydrochloride) 500 MG Oral Tablet, per the NIH.
Valacyclovir Hydrochloride is a human prescription drug. The active pharmaceutical ingredient is valacyclovir hydrochloride and is classified as, "DNA Polymerase Inhibitors [MoA], Herpes Simplex Virus Nucleoside Analog DNA Polymerase Inhibitor [EPC], Herpes Zoster Virus Nucleoside Analog DNA Polymerase Inhibitor [EPC], Herpesvirus Nucleoside Analog DNA Polymerase Inhibitor [EPC], Nucleoside Analog [Chemical/Ingredient]."
This pill is made by a total of 4 firms: (1) Greenstone LLC, (2) McKesson Packaging Services a business unit of McKesson Corporation, (3) NorthStar Rx LLC, and (4) Aurobindo Pharma Limited.
There are 2 other blue pills that with a similar imprint: "F 82". They may be a different dosage of the same drug or a different drug entirely.