For proctitis caused by viral infections, such as the sexually transmitted virus herpes, your doctor may prescribe an antiviral medication, such as acyclovir (Sitavig, Zovirax, others). Treatment for proctitis caused by radiation therapy. Mild cases of radiation proctitis may not require treatment.
https://www.mayoclinic.org/diseases-conditions/proctitis/diagnosis-treatment/drc-20376938