Increased risk of infection
Although probiotics are usually safe to use, according to a review, adults and children with compromised immune systems or severe illnesses should avoid using probiotics. Some individuals with these conditions have experienced fungal or bacterial infections as a result of probiotic use.
A person having a condition that affects his immune system, he should speak with his doctor before taking probiotics.
Also, anyone who is using antifungal medication should wait until the infection has gone before taking probiotics.