<unk> (injection) is a anti-Infective agent ,  antiviral and guanosine nucleoside analog that is FDA approved for the treatment of CMV retinitis in immunocompromised patients. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include pruritus, sweating, diarrhea, loss of appetite, vomiting, anemia, neutropenia, thrombocytopenia, infectious disease, neuropathy,fever and shivering.
Ganciclovir 
Valganciclovir hydrochloride
Valacyclovir
Acyclovir 
Penciclovir
Tenofovir
Letermovir
Cidofovir