Antibiotic medicines are not the standard primary treatment for anal fissures, they are used in specific cases where an infection is present. An anal fissure is can last longer than 6 to 8 weeks. Your experience of healing for a few days before the pain returns is common, the wound often begins to close but is reopened by the trauma of a hard stool or the pressure from a tight sphincter muscle.
Next Steps
Maintain High Fiber & Hydration, Sitz Baths , Avoid Straining during bowel movements
Health Tips
Since your symptoms have persisted for two months, it is advisable to consult for evaluation to determine if you need specialized ointments, antibiotics , or a surgical procedure