The oral cavity is constantly bathed in the natural defense system called the saliva. It is one of the main fluids secreted from our body. Apart from its functional purposes, it also serves to be a medium for the excretion for the drugs that enter into our body. Every drug that enters into our body gains access to the salivary gland and is secreted into the oral cavity through the salivary ducts; the mucous membranes in the mouth absorbs substances before the drug could reach the stomach or intestines; moreover, it is quite possible to detect parenteral administration of drugs in saliva because drugs tend to show up through the mucous membranes along (more…)