Antivirales

Atazanavir is a HIV-1 protease inhibitor, used in the anti-retroviral therapy of adult and sometimes paediatric patients infected with HIV. In in vitro studies with human pulmonary epithelial cells, atazanavir has been studied as a potential inhibitor of SARS-CoV-2 Mpro protease, with the aim of halting viral replication.

Etravirine is a non-nucleoside reverse transcriptase inhibitor (NNRTI) medication used in the treatment of human immunodeficiency virus (HIV) infections. It works by blocking reverse transcriptase, an enzyme essential for replication of the virus, thereby preventing the virus from multiplying and spreading. Etravirine is often used in combination with other antiretroviral drugs to effectively treat HIV/AIDS. It is commonly prescribed for patients with virus strains that are resistant to other NNRTI medications due to mutations that confer resistance- mutations K103N and Y181C. Etravirine is a diarylpyrimidine (DAPY) and has conformational isomerism meaning that it binds reverse transcriptase in an fleible manner, under multiple conformations. The impact of specific point mutations in the virus is therefore lessened.

Ledipasvir D-tartrate is an antiviral compound, which is a direct-acting antiviral agent used in the treatment of hepatitis C virus (HCV) infection. It originates from synthetic sources designed to inhibit the replication of specific viral proteins. Ledipasvir functions by targeting the NS5A protein of the hepatitis C virus, a key component necessary for viral replication. By binding to this protein, Ledipasvir disrupts and inhibits the HCV replication complex, effectively suppressing the viral load in patients.

Cytarabine is also known as cytosine arabinoside (ara-C) and is a chemotherapy drug that works by inhibiting DNA synthesis. It acts as a nucleoside analogue, which is incorporated into the growing DNA chain during replication. Cytarabine combines a cytosine base with an arabinose sugar (1β-arabinofuranosylcytosine) and is an analog for human deoxycytosine. Cytarabine interferes with DNA synthesis as it is rapidly converted to cytosine arabinoside triphosphate, damaging DNA when cells are in the synthesis phase (S phase). Tumor cells which are highly mitotic and growing rapidly are therefore preferably targeted. Cytarabine also inhibits nucleotide reductase enzymes as well as nuclear polymerases, leading to interruption and inhibition of synthesis, strand breaks and cell death.

Emtricitabine is an antiviral drug that is used to treat chronic viral hepatitis, which is caused by the hepatitis B and C viruses. The drug blocks the activity of reverse transcriptase, which is an enzyme necessary for the replication of viral RNA in the body. Emtricitabine has been shown to be effective against acute hepatitis B virus infection and chronic hepatitis B virus infection with or without cirrhosis. It also has been shown to be effective against chronic hepatitis C virus infection with or without cirrhosis.

Adefovir is an antiviral drug that is used for the treatment of hepatitis B infections. This drug works by blocking the enzyme reverse transcriptase, therefore preventing the replication of the virus in the body.

Anti-viral; NS3/4A protease inhibitor

Dapivirine is a non-nucleoside reverse transcriptase inhibitor with action on HIV-1 reverse transcriptase and is used for preventing HIV infection through vaginal rings.

HIV-1 Integrase Inhibitor is an antiretroviral compound with a mode of action that blocks the viral enzyme integrase, preventing the integration of viral DNA into the host genome. It is used for the treatment of HIV infection.

Viramidine is a nucleotide analogue prodrug, which is derived from naturally occurring nucleosides, specifically optimized for enhanced therapeutic profiles. Its mode of action involves conversion into ribavirin triphosphate within the body. This active form inhibits viral RNA polymerase, a critical enzyme necessary for viral replication. By disrupting the synthesis of viral RNA, Viramidine effectively reduces viral proliferation within host cells.

Tenofovir diphosphate is an antiviral compound, which is a key active metabolite derived from the prodrugs tenofovir disoproxil fumarate and tenofovir alafenamide, both originating from chemical synthesis. Its mode of action involves inhibiting the activity of HIV-1 reverse transcriptase by competing with the natural substrate, deoxyadenosine 5’-triphosphate, and causing chain termination after incorporation into viral DNA. This mechanism effectively prevents the replication of retroviral DNA, thus halting the progression of the infection.

Abacavir sulfate is a pharmaceutical compound classified as a nucleoside reverse transcriptase inhibitor (NRTI), which is derived from synthetic sources. Its mode of action involves the inhibition of the reverse transcriptase enzyme, essential for the replication of HIV. By incorporating itself into the viral DNA chain during replication, Abacavir effectively halts the process, preventing further multiplication of the virus within the host cells.

This antiretroviral medication is primarily used in the management and treatment of human immunodeficiency virus (HIV-1) infections. Abacavir sulfate is a critical component in highly active antiretroviral therapy (HAART), contributing to the reduction of viral load, enhancing immune function, and improving the long-term clinical outcomes in patients living with HIV. Its application in combination therapies has been instrumental in transforming HIV from a fatal disease into a manageable chronic condition.

SE 563 is a biocontrol agent, which is an organism-based product derived from natural sources. It is sourced from a specific strain of entomopathogenic nematodes known for their effectiveness in targeting and controlling insect pests. The mode of action involves the nematodes seeking out their insect hosts in the soil, entering through natural openings, and releasing symbiotic bacteria that kill the host from within.

Tromantadine hydrochloride is a synthetic antiviral compound, which is a derivative of adamantane. It originates from chemical synthesis, tailored specifically to target viral processes. Tromantadine hydrochloride primarily exerts its effects by inhibiting the penetration of virus particles into host cells and impeding the subsequent stages of viral replication. This mode of action effectively reduces the viral load and hinders the progression of the infection.

Carbovir triphosphate triethylamine is a nucleotide analog, which is a derivative of nucleoside analogs designed for antiviral applications. It is synthesized through chemical modification of guanosine analogs, resulting in its active triphosphate form. This compound functions as a potent antiretroviral agent by mimicking natural nucleotides and interfering with viral DNA synthesis. The active triphosphate impedes the action of viral reverse transcriptase by incorporating itself into the viral DNA chain, causing premature termination and effectively halting viral replication.

Ganciclovir is an antiviral agent specifically designed for culture media use. It is a synthetic analogue of 2'-deoxy-guanosine, derived from nucleoside compounds, and operates primarily by inhibiting the replication of viral DNA. Its mode of action involves selective phosphorylation by viral kinases, which converts it into ganciclovir triphosphate, a potent inhibitor of viral DNA polymerase, ultimately preventing viral DNA synthesis.

Equisetin is a secondary metabolite, which is produced by the fungus *Fusarium equiseti*. It operates predominantly through the inhibition of protein synthesis and interference with cellular processes within target organisms. Equisetin exhibits potent antibacterial and antifungal activities primarily by interfering with cell wall synthesis in bacteria and disrupting key pathways in fungi.