Is there any medicine that can decrease snoring?

Caffeine!: Because if your awake, you can't snore! seriously, no, there is no medication that can decrease snoring. Weight reduction, avoiding excess alcohol, and getting a sleep study to check for sleep apnea would be a good idea though. You might also consider an oral appliance from your dentist.

Not really: Should see your doctor and consider a sleep study. Meds can mask an underlying, more severe health problem.