Hello, I would like to welcome you to Health Care Magic. I understand your concern. Firstly I would say that the medications your doctor prescribed to you are a good treatment choice, but not as in your case to a breastfeeding mother. I wouldn t concern about Acyclovir and Hifenac, as much as regarding Carbadac, because there is potential for serious adverse reactions in nursing infants from carbamazepine (Carbadac). Regarding Hifenac, the safety of this medicine for use during breastfeeding has not been established and it is recommended that this medicine should be avoided where possible by women who are breastfeeding. However, the most important drug for your treatment, Acyclovir, passes in clinically insignificant concentrations in the milk, so breast feeding can be continued without adverse effects to the nursing infant. With such presentation on my clinic, firstly I would present two you 2 choices, one to change the medication into a safer one and the other one to continue with the actual treatment and discontinue feeding your baby with breast milk during your recovery. There is no problem to start using other nutritional products for your child, since now he/she is already 8 months old. I will not forget to mention that shingles or herpes zoster is spread through contact with the lesions and you could infect your infant. So I would recommend that if the lesions are on only one breast, you may continue breastfeeding on the unaffected breast while pumping and discarding on the affected breast. You should keep the affected breast covered and use meticulous handwashing with each breastfeeding session to decrease risk to the infant. If the lesions are on both breasts, you should pump and discard and give an alternative form of nutrition until the lesions are scabbed over (no longer infective). If the lesions are not on the breast, then you may breastfeed from both breasts while keeping the affected body area covered. I wish to you both a healthy life!