Fostemsavir is in clinical development for human immunodeficiency virus-1 (HIV-1) infection in heavily treatment-experienced adults. HIV is a virus that damages the cells in the immune system and weakens the body’s ability to fight everyday infections and diseases. HIV infection is incurable but there are effective treatments that enable most infected people to live a healthy life. Antiretroviral (ARV) medicines are used to treat HIV. However, poor adherence and the subsequent development of drug resistance is one reason why HIV treatment can fail. A drug-resistant HIV strain is one which is less susceptible to the effects of one or more anti-HIV drugs. For highly treatment-experienced patients who have failed on a number of treatment regimens and have limited treatment options, complex regimens including drugs to which the virus is partially resistant may be required.
Fostemsavir is given orally as a tablet. It is an ARV medicine that prevents HIV from attaching to host cells. It acts by binding to a specific protein on the surface of the virus which prevents the virus from attaching to the host immune cells. This first-in-class mechanism of action has the potential to have full activity against HIV strains that have developed resistance. If licensed, fostemsavir will offer a treatment option for patients with HIV-1 infection in heavily treatment-experienced adults who have limited treatment options available.
Baloxavir marboxil is given by mouth as tablets and works in a different way to existing flu medications by blocking a specific process which influenza viruses use to multiply within the body. There is evidence that this medication may be effective in people for whom existing flu medicines do not work. Additionally, only one dose of baloxavir marboxil is needed whereas existing flu prevention medications need to be taken over several days. If licenced, baloxavir marboxil may offer an additional prevention option for individuals who have been in contact with someone who has influenza.