Not much study has been done on Pyrithione zinc during breastfeeding however itís known to get absorbed in skin in some extant (Less than 1%). Topical usage is not likely to cause much problem but itís suggested to search for safer alternative.
During whole lactation period you shall first discuss with your doctor and then together you shall decide whether you shall take that drug or not however if you have already taken Sebastian Purist Antidandruff | Pyrithione Zinc Shampoo then you shall inform your doctor, But you should not be worried too much as Sebastian Purist Antidandruff | Pyrithione Zinc Shampoo comes in category of low risk drug.
Though Sebastian Purist Antidandruff | Pyrithione Zinc Shampoo dose not comes in category of safe drugs rather it comes in category of low risk but if your doctor is aware that you are breastfeeding your baby and has still recommended it then its advantages must be outweighing the risks.
National Womens Health and Breastfeeding Helpline: 800-994-9662 (TDD 888-220-5446) 9 a.m. and 6 p.m. ET, Monday through Friday
National Breastfeeding Helpline: 0300-100-0212 9.30am to 9.30pm, daily
Association of Breastfeeding Mothers: 0300-330-5453
La Leche League: 0345-120-2918
The Breastfeeding Network supporter line in Bengali and Sylheti: 0300-456-2421
National Childbirth Trust (NCT): 0300-330-0700
National Breastfeeding Helpline: 1800-686-268 24 hours a day, 7 days a week
Telehealth Ontario for breastfeeding: 1-866-797-0000 24 hours a day, 7 days a week