The drug has been that chemical substance that has been purified and that is used for treatments, cures, prevention and diagnoses of certain diseases or, by default, inhibit the appearance of a physiological process that is not wanted. The fundamental characteristics of the drug is that it is a substance very similar to that produced by the body and causes a change in cell activity.
A clear example that can perfectly define this concept is the case of an individual with diabetes, who thanks to his disease the body cannot produce its own hormone, that is, insulin from the cells of the pancreas, so to maintain the stability of the patient, externally inject the insulin he needs.
There are several pharmaceutical forms, under which drugs can be presented and marketed, with the sole purpose of therapeutic benefits for the affected person and to minimize the collateral effects that these sometimes produce. Among those that are: the liquids that are integrated by syrups, aerosols, eye drops, among others. Solid, made up of powders, granules, dragees, pills, among others. Semisolid, pastes, cream, ointment, suppositories, among others.
Certain environmental studies have raised an important alert worldwide, regarding the contamination that the interaction of various drugs with each other can produce into the atmosphere and is due to the fact that when a person becomes ill and ingests a drug to cure themselves, it will later be expelled from the body through urine and feces which will reach wastewater and then rivers or seas, however, the deficient purification treatment carried out by some purification plants means that pharmacological residues cannot be completely disappeared, producing the aforementioned contamination.
