Cold sores, also known as fever blisters, are lesions that occur as a result of an infection with the herpes simplex type 1 virus. MayoClinic.com says that specific cold sore symptoms include small blisters around the mouth that can last for as long as 10 to 14 days. There are prescription medications for cold sores that can decrease the appearance of these unsightly blisters.
Famciclovir
Famciclovir, typically sold in drug stores as Famvir, is a type of antiviral medication. It specifically stops the herpes virus from spreading throughout the body. Drugs.com says that famciclovir's minor side effects include dizziness, sleepiness, diarrhea, nausea, stomach pain and a skin rash. Famciclovir can also cause an allergic reaction, with signs such as hives, difficulty breathing, and swelling of the throat, tongue or lips. It is crucial to call 911 when famciclovir leads to these effects. Having a weak immune system, kidney disease and lactase deficiency may require a decrease in famciclovir's dose. Famciclovir is taken as a tablet daily or as a doctor prescribes.
Valacyclovir
Valacyclovir, typically sold as as Valtrex, is another antiviral medication that halts the progression of the herpes virus. Drugs.com says that valacyclovir treats cold sore in people who are at least 12 years old, and can also treat the chicken pox. Some of valacyclovir's minor effects include stomach pain, menstrual pain, a sore throat and a stuffy nose. Valacyclovir's serious side effects include confusion, lower back pain, vomiting, bloody diarrhea and yellowing of the skin. It is important to call a doctor when valacyclovir leads to these effects. Having HIV or AIDS or kidney disease may require a decrease in valacyclovir's dose. This medication is a tablet taken once a day or as prescribed.
Acyclovir
Acyclovir, commonly sold as Zovirax, can stop the herpes virus that leads to shingles, the chicken pox and genital herpes. Acyclovir's minor side effects include a headache, lightheadedness, diarrhea, stomach pain, and swelling of the feet or hands. Some of acyclovir's serious effects include decreased urination, lower back pain, weakness, and easy bleeding or bruising. Acyclovir is a liquid or tablet taken once a day or as a doctor describes.
