How can i most quickly get rid of fever blisters/ cold sores?

Best RX is TIME: The lesion undergoes a series of changes and heals over 14-21 days--after which the virus goes dormant. Anti-viral drugs based on Acyclovir are available by prescription and can be taken as a preventive med. Otc meds, like abreva, have variable success rates. If they occur frequently, you can take Valtrex (valacyclovir) daily as a preventive measure, but will need a prescription. There is no 'fast' way.

Treating cold sores: To shorten the duration of a cold sore, antiviral medications need to be taken as soon as symptoms (itch, sensitivity, pain) start, even before the breakout appears. For recurrent cold sores, suppressive treatment with daily antiviral medication does well. The faster the cold sore dries up, the faster it will go away, so topical medications that will help dry it are helpful.