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A vital class of drugs called antivirals is created to fight viral infections in the human body. Antivirals specifically target viruses, which are considerably smaller and simpler creatures than bacteria, in contrast to antibiotics, which are effective against bacterial infections. These drugs function by either blocking the entry of viruses into host cells, inhibiting the virus's ability to replicate within cells, or strengthening the immune system's defense against the virus. An antiviral drug that is well-known is oseltamivir, which is often marketed as Tamiflu. Treatment for influenza infections is its principal usage, particularly during flu seasons. The mechanism of action of oseltamivir is to block the neuraminidase enzyme, which the influenza virus need to propagate from infected to healthy cells. The drug helps lessen the intensity and duration of flu symptoms by inhibiting this enzyme. Acyclovir, another important antiviral, is used to treat infections brought on by the varicella-zoster virus (VZV) and herpes simplex virus (HSV). While VZV causes chickenpox and shingles, herpes infections can present as genital herpes or cold sores around the mouth. Acyclovir prevents the virus from multiplying and spreading throughout the body by interfering with its ability to synthesize DNA. This lessens the frequency of outbreaks and helps to relieve symptoms. The treatment for HIV/AIDS, a virus that targets the immune system, involves taking many antiretroviral medications. Although these drugs cannot treat HIV, they can successfully manage the infection, enabling persons who are affected to enjoy long, healthy lives. In antiretroviral therapy (ART), medications like as tenofovir, emtricitabine, and efavirenz are frequently utilized. They aim to stop the virus from entering cells, to slow down its reproduction, or to stop the creation of new virus particles, among other stages of the HIV life cycle. Research on antivirals has broadened recently to include therapies for newly developing viruses such as SARS-CoV-2, the virus that causes COVID-19. Remdesivir is one medication that has demonstrated promise in lessening the intensity of COVID-19 patients' disease and speeding up their recuperation. By impeding the virus's capacity to multiply within human cells, these antivirals limit the virus's ability to spread throughout the body. Antivirals are essential to contemporary medicine because they provide hope for the treatment of viral infections that were previously incurable or challenging to control. Fighting against current and new viral hazards to public health requires ongoing research and development in this area.