Typhivax 0.25mcg Injection is an active immunizing agent. It is given to prevent typhoid fever caused by certain bacteria called S. Typhi. It is usually administered at least 2 weeks prior to expected exposure to S. Typhi. Typhivax 0.25mcg Injection is administered by a healthcare professional and should not be self-administered. It is recommended for travelers to areas where a recognized risk of exposure to typhoid exists. Its effectiveness lasts for around 3 years from the time of vaccination. Booster injection is required every 3 years to provide continued immunity. Some common side effects of this medicine include injection site reactions (such as pain, swelling, redness), malaise, headache, nausea, and diarrhea. If these side effects do not go away with time or get worse, let the doctor know. The doctor may help with ways to reduce or prevent these symptoms. To make sure the vaccine is safe, before receiving the vaccine, it is important to let the doctor know if you have any other illnesses. You should also tell the doctor about all the medicines you are taking. Pregnant and breastfeeding mothers should consult and seek advice from their doctor before receiving the vaccine.