Based on the information available, there is no evidence to suggest that Famciclovir directly causes miscarriage. Famciclovir is an antiviral medication used to treat infections caused by certain viruses, such as herpes simplex and varicella-zoster [1].

According to the National Library of Medicine, there are no studies or reports indicating that Famciclovir increases the risk of miscarriage [2]. However, as with any medication, it is important to consult with a healthcare provider before use, especially during pregnancy, to discuss the potential risks and benefits [3].

It is also worth noting that Famciclovir is classified as a pregnancy category B drug by the Food and Drug Administration (FDA), which means that it is not expected to harm an unborn baby [4]. However, this classification is based on limited human data and further studies are needed to fully understand the potential effects of Famciclovir on pregnancy.

In conclusion, while there is no direct evidence linking Famciclovir to miscarriage, it is always recommended to consult with a healthcare provider before taking any medication during pregnancy.

Sources:

1. [DrugPatentWatch.com - Famciclovir](https://www.drugpatentwatch.com/drugs/famciclovir)
2. [National Library of Medicine - Famciclovir](https://medlineplus.gov/druginfo/meds/a601235.html)
3. [Mayo Clinic - Medications and Pregnancy: What's Safe?](https://www.mayoclinic.org/healthy-lifestyle/pregnancy-week-by-week/expert-answers/medications-and-pregnancy/faq-200585)
4. [FDA - Pregnancy Categories (A, B, C, D, X)](https://www.fda.gov/media/74150/download)