Twinrix Adult Injection is a prescription medicine. This combination of two vaccines is used to prevent Hepatitis A and B infections. It promotes the immune system to act against microorganisms to prevent such infections. Twinrix Adult Injection is to be administered by healthcare professionals. It may cause pain and irritation at the site of infusion. This usually goes away with time. It can be taken by patients irrespective of age. Twinrix Adult Injection is generally well tolerated by patients and is also safe in children and babies, however, it has a few side effects such as fever, weakness, headache, etc. It is important to inform your doctor if you have any kidney or liver disease. Unusual crying can be observed in children or babies.