Antivirals
Antibiotics don't work here
Every generic name in this class ends in -vir. Viral infections — cold sores, shingles, genital herpes and COVID-19.
Blocks a step the virus needs to copy itself.
The 3 antivirals in the PTCB Top 200
| Generic | Brand | Common use |
|---|---|---|
| Valacyclovir | Valtrex | herpes (HSV, shingles) |
| Acyclovir | Zovirax | herpes (HSV, VZV) |
| Nirmatrelvir / Ritonavir | Paxlovid | COVID-19 (mild-moderate) |
Tap any generic name for its full drug guide — brand↔generic, side effects, interactions and the exam tip.
What to know for the exam
- check_circleGeneric names in this group contain -vir.
- check_circleWorks best when started as early as possible after symptoms appear.
- check_circleValacyclovir is a prodrug of acyclovir with less frequent dosing.
- check_circleGood fluid intake is advised with acyclovir to protect the kidneys.
Nirmatrelvir/ritonavir has an unusually long interaction list — every profile needs a full check before dispensing.
Antibiotics do not treat viral illness. That distinction shows up regularly in scenario questions.
Drill antivirals the way the PTCE asks them
RxReflex groups the Top 200 drugs into classes like this one, then quizzes you on brand↔generic, class, side effects and interactions. Plus a guided Learn path, pharmacy math and 40+ cheat sheets. Free to start.
Frequently asked
What does the suffix -vir mean? add
A generic drug name ending in -vir identifies it as one of the antivirals. Viral infections — cold sores, shingles, genital herpes and COVID-19.
What drugs are in the antivirals class? add
Valacyclovir, Acyclovir, Nirmatrelvir / Ritonavir. All are in the PTCB Top 200.
What are antivirals used for? add
Viral infections — cold sores, shingles, genital herpes and COVID-19.
How do antivirals work? add
Blocks a step the virus needs to copy itself.
Last reviewed August 7, 2026. For education only — not medical advice. Not affiliated with or endorsed by the PTCB.