See the DrugPatentWatch profile for famciclovir

Famciclovir is a medication commonly used to treat viral infections, such as herpes simplex and varicella-zoster (shingles) [1]. While famciclovir is generally considered safe and effective, like all medications, it can have side effects. While common side effects are relatively well-known, rare side effects may be less so.

Rare side effects of famciclovir include:

* Anaphylaxis: A severe, life-threatening allergic reaction that can cause difficulty breathing, rapid heartbeat, and hives [2].
* Stevens-Johnson syndrome: A severe skin reaction that can cause skin rash, blistering, and sloughing of the skin [2].
* Toxic epidermal necrolysis: A severe skin reaction that can cause widespread skin damage and organ failure [2].
* Angioedema: Swelling of the face, lips, tongue, or throat that can cause difficulty breathing [2].
* Seizures: Uncontrolled electrical activity in the brain that can cause convulsions, loss of consciousness, and other symptoms [2].
* Renal failure: The inability of the kidneys to filter waste and fluids from the blood, leading to a buildup of toxins in the body [2].
* Hepatitis: Inflammation of the liver that can cause jaundice, abdominal pain, and other symptoms [2].
* Neutropenia: A decrease in the number of white blood cells, which can increase the risk of infection [2].

It is important to note that these rare side effects are not common and may not occur in everyone who takes famciclovir. If you experience any of these symptoms while taking famciclovir, seek medical attention immediately.

Sources:

[1] Famciclovir. (2022). Retrieved from <https://www.drugs.com/famciclovir.html>

[2] Famciclovir (Oral Route) Side Effects. (2022). Retrieved from <https://www.mayoclinic.org/drugs-supplements/famciclovir-oral-route/side-effects/drg-20063530?p=1>

[3] Famciclovir. (2022). Retrieved from <https://www.drugpatentwatch.com/drugs/famciclovir>