The antiviral drugs have been approved for treatment of acute uncomplicated influenza and for some preventive uses. There are four FDA-approved influenza antiviral drugs recommended by CDC for use against recently circulating influenza viruses.
In the treatment group, oseltamivir reduced the duration of illness from 95 to 53 hours and reduced the severity by 50%, compared with placebo. A placebo-controlled study of oseltamivir by Treanor et al demonstrated the ability of this agent to decrease the duration and severity of influenza.
The most useful anti-influenza medications for treating infection with influenza are neuraminidase inhibitors – oseltamivir (trade name: Tamiflu®) and zanamivir (trade name: Relenza®).
The inhibitory effects of antivirals on immune cells may contribute to the immune deterioration observed in patients following prolonged use of the drugs.
The FDA has approved an antiviral drug called remdesivir (Veklury) to treat COVID-19 in adults and children who are age 12 and older. Remdesivir may be prescribed for people who are hospitalized with COVID-19 . It’s given through a needle in the skin (intravenously).
Typically, flu virus is called resistant after sufficient evidence was gathered to prove a lack of antiviral effect of a particular antiviral medication in patients infected with such virus.
Prolonged antiviral drug exposure and ongoing viral replication due to immunosuppression are key factors in the development of antiviral drug resistance, which may manifest as persistent or increasing viremia or disease despite therapy.
Antiviral agents are drugs approved by the Food and Drug Administration (FDA) for the treatment or control of viral infections. Available antiviral agents mainly target stages in the viral life cycle.
The benefits of antiviral treatment are likely to be greatest if treatment is started as soon as possible after illness onset, and evidence for benefit is strongest in studies in which treatment was started within 48 hours of illness onset.
What drugs treat viruses?
The drugs used for viral infection are Acyclovir (Zovirax), famciclovir (Famvir), and valacyclovir (Valtrex) are effective against herpesvirus, including herpes zoster and herpes genitalis. Drugs used for treatment for viral fever are Acetaminophen(Tylenolothers)ibuprofen (Advil,motrin IB others).