Hepatitis B Vaccine (rDNA)+Aluminium Hydroxide+Thiomersal is a prescription medicine. This combination of three vaccines is used to prevent Hepatitis B infection. It stimulates the immune system to act against microorganisms to prevent such infections. May Treat: Prevention of Hepatitis B infection Alternate Brand Names: Revac Manufacturer: Biological E Ltd Pregnancy: CONSULT YOUR DOCTOR - Hepatitis B Vaccine (rDNA)+Aluminium Hydroxide+Thiomersal may be unsafe to use during pregnancy. However, the benefits from use in pregnant women may be acceptable despite the risk. Please consult your doctor.