Tenofovir disoproxil fumarate and tenofovir disoproxil fumarate fumarate are different drugs. Although the names are similar, the active ingredients and uses are different.

Remdesivir: It is an antiviral drug used to treat some viral infections, especially some coronaviruses, such as coronavirus pneumonia-19. It helps to alleviate diseases by inhibiting virus replication in human body.

Famciclovir/Penciclovir: Tenofovir fumarate is a drug used to treat viral infections, mainly used to treat herpes simplex virus infections, such as herpes zoster and genital herpes. Its mechanism of action is to prevent the DNA replication of the virus.

These two drugs have different ingredients and indications, so they can't be used instead of each other. If you have any medical problems related to these drugs or need medication, it is recommended to consult a doctor for professional advice and prescription. Don't use these drugs yourself.