Many people are allergic to a particular medication, but they don't know what they are allergic to. For example, many people have problems with food sensitivities. When a drug is added to their diet, people will have an allergic reaction. For those who have a particular allergy to a certain medication, but don't know what it is, there are many products to help. Here are some things you might consider getting from a health food store. Food allergy is a very common problem among the elderly, who are often at risk for developing a severe allergic reaction. The best products against parasites include a daily probiotic (which is made from the human gut bacteria). This will help to prevent infection. You can use it on your dog, but they should be fed in small amounts to avoid food poisoning. Also, I recommend a daily probiotic on the pet's bottom as well. The most common parasite found in humans is C. difficile (CD). This parasite is spread to the intestine through the mouth, and can cause a number of serious infections, such as diarrhea and ulcerative colitis (also called Crohn's disease). If your pet has CD, the treatment is different. If you don't want to treat them with antibiotics, you can try treating them with a probiotic.