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The definition of the topical route of administration sometimes states that both the application location and the pharmacodynamic effect thereof is local. [ 3 ] In other cases, topical is defined as applied to a localized area of the body or to the surface of a body part regardless of the location of the effect.
Administration can take place via enteral administration (absorption of the drug through the gastrointestinal tract) [2] or parenteral administration (generally injection, infusion, or implantation). [3] [4] Contrast with topical administration where the effect is generally local. [4]
The pharmacological definition cannot apply to these substances because utilization and absorption is a function of the nutritional status and physiological state of the subject, [10] resulting in even greater differences from individual to individual (inter-individual variation). Therefore, bioavailability for dietary supplements can be ...
Parenteral nutrition (PN), or intravenous feeding, is the feeding of nutritional products to a person intravenously, [1] bypassing the usual process of eating and digestion. The products are made by pharmaceutical compounding entities or standard pharmaceutical companies.
AUC is a useful metric when trying to determine whether two formulations of the same dose (for example a capsule and a tablet) result in equal amounts of tissue or plasma exposure. Another use is in the therapeutic drug monitoring of drugs with a narrow therapeutic index .
First-pass metabolism may occur in the liver (for propranolol, lidocaine, clomethiazole, and nitroglycerin) or in the gut (for benzylpenicillin and insulin). [4] The four primary systems that affect the first pass effect of a drug are the enzymes of the gastrointestinal lumen, [5] gastrointestinal wall enzymes, [6] [7] [8] bacterial enzymes [5] and hepatic enzymes.
Horizontal transmission: through directly contacts with infected body fluids, like blood and lymph, in ways like sexual contacts, from health-care workers, or parenteral exposure; indirectly through transfusions and haemodialysis, and contaminated medical practices. Vertical transmission: through perinatal periods, mother to child.
Sublingual administration (SL), dissolved under the tongue, but due to rapid absorption many consider SL a parenteral route; Oral (PO), swallowed tablet, capsule or liquid; Enteral medications come in various forms, including [3] oral solid dosage (OSD) forms: [4] Tablets to swallow, chew or dissolve in water or under the tongue