Final answer:
Valacyclovir is the medication given to reduce exacerbated symptoms of multiple sclerosis.
Step-by-step explanation:
The medication that will be given to reduce the amount of time a client experiences exacerbated symptoms of multiple sclerosis is valacyclovir. Valacyclovir is an antiviral medication that is used to reduce symptoms and risk of transmission in viral infections such as herpes simplex and influenza. It can help reduce the severity and duration of symptoms, providing relief to the client.