Displaying 3 results of Penciclovir Stable Isotopes Penciclovir stable isotopes are non-radioactive versions of the antiviral drug penciclovir, which is commonly used to treat various viral infections such as herpes simplex virus and varicella-zoster virus. These stable isotopes are chemically identical to the regular isotopes of penciclovir, but offer several advantages in research and clinical settings, including increased sensitivity and specificity in analytical techniques and reduced potential for radioactive exposure.