The doctor may combine drugs which act on different areas, increasing the dose of each of one until side affects appear, then adding another drug and increasing that the same way. Some patients may respond to the first drug used and be hardy enough not to suffer ill-effects, and others may seem to suffer every [...]

Most of the substances are salicylates or their derivatives. Dr Feingold listed 13 groups of additives which contain more than 2500 different chemicals. One of the most common is called tartrazine and is a yellow dye. It is a salicylate and related to aspirin and is also known by a variety of other names or [...]