While there are no known birth defects associated with the medication, it is not safe to take more than prescribed at any time, so pregnant women taking acyclovir should take the medication as outlined by your doctor. Acyclovir will not cure herpes, but it can lessen theLicensure Nursing PhysicianGuide – Multum acyclovir (injectionpeople, even while you are being nobrfeed Acyclovir can pass intoand may harm a nursing baby. WebMD provides important information about Acyclovir Oral such as if you can you take Acyclovir Oral when you are pregnant or nursing or If Acyclovir Oral dangerous for children or adults over 60. Take acyclovir for the entire length of time prescribed by your doctor. Your symptoms may get better before the infection is completely treated. Treatment with acyclovir should be started as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters). Herpes infections are contagious and you can infect other people, even while you are being treated with. Continued. Acyclovir was found in the breast milk. However, the amount seen in the milk was considerably less than that used to treat infants that have been infected with herpes. Can I use acyclovir/valacyclovir while breastfeeding my baby? Yes. Acyclovir enters breast milk, but the amount of medication the baby receives is low. Summary of Use during Lactation. Even with the highest maternal dosages, the dosage of acyclovir in milk is only about 1% of a typical infant dosage and would not be expected to cause any adverse effects in breastfed infants. Doing this when you can't or shouldn't give your milk to your baby enables you to keep up your milk supply and eventually start nursing again. In some cases, it might be possible to take your medication immediately after nursing, wait a while, then nurse your baby again just before it's time to take your next dose. Can I take Acyclovir while breastfeeding? Even with the highest maternal dosages, the dosage of acyclovir in milk is only about 1% of a typical infant dosage and would not be expected to cause any adverse effects in breastfed infants. Can I take Valacyclovir while breastfeeding? The dosage of acyclovir in milk after valacyclovir is less than 1% of a typical infant dosage and would not be expected to cause any adverse effects in breastfed infants.