Decide with your doctor whether drug benefits justify risk to unborn child. Child may become sensitive to penicillins and have allergic reactions to penicillin drugs. Avoid nafcillin or discontinue nursing until you finish medicine. Consult doctor for advice on maintaining milk supply. Most hazardous reactions likely to occur a few minutes after taking nafcillin.
Injections are more reliable.
May interfere with the accuracy of some medical tests. Birth control pills may not be effective. Use additional birth-control methods. Birth control pills Impaired contraceptive efficiency. Chloramphenicol Decreased effect of both drugs.