Vaccines What are the side effects of the 6 in 1? January 30, 2026 by pups | Leave a Comment The 6-in-1 vaccine is a combination vaccine that protects against six serious diseases in a single injection: diphtheria, tetanus, whooping cough (pertussis), polio, Haemophilus influenzae type b (Hib), and hepatitis B. While generally safe and effective, it can cause some side effects, which are usually mild and temporary. What Are the Common Side Effects of […] Read more »