It only took a while until modern pharmaceutical companies emerged to dispense highly regulated drugs that provide treatment for a wider range of patients. Both OTC and prescriptions that treat such ailments as migraines, arthritis and fibromyalgia usually have undesirable side effects, frequently a result of the additives, fillers and other agents that may cause allergies and other adverse reactions. The compounded versions of the hormones will be just for you, so that your body reacts as best as it can with the hormones.