Some medical conditions may interact with generic Zovirax cream. Tell your local doctor if you have any medical conditions, such as: if you are pregnant, planning to become pregnant, or are breast-feeding, if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement, if you have allergies to medicines, foods, or other substances Some medicines may interact with this cream. Because little, if any, is absorbed into the blood, the risk of it interacting with another medicine is low. In the case of generic zovirax tablets, a local physician must be aware of any medicines that may harm the kidney, because the risk of kidney side effects may be increased. Ask your local doctor if you are unsure if any of your medicines might harm the kidney.