Acyclovir
"I love this medication. I've always used abreva but decided to get a prescription because abreva took forever to kick in. I recently had an outbreak because of stress at work. It started with one blister. I put the ointment and it went away in 24 hours with a minimal scab. I then had another outbreak 2 days after. This one also went away immediately with a minimal scab. The same weekend I got a bad outbreak where my lip swole up as well. I applied the ointment at night. The next day by 6pm the swelling was gone and the blisters became a tiny scab. I LOVE this ointment."