Enteral administration

Enteral administration is food or

enteros 'intestine'.

Forms

Enteral administration may be divided into three different categories, depending on the entrance point into the GI tract: oral (by mouth), gastric (through the stomach), and rectal (from the rectum). (Gastric introduction involves the use of a tube through the nasal passage (NG tube) or a tube in the belly leading directly to the stomach (PEG tube). Rectal administration usually involves rectal suppositories.)

Oral administration		Rectal administration
Solids	Liquids	-
Pill	Solution	Ointment
Tablet	Softgel	Suppository
Time release technology	Suspension	Enema
Osmotic controlled release capsule	Emulsion	Murphy drip
	Syrup	Nutrient enema
	Elixir
	Tincture
	hydrogel

Drug absorption from the intestine

The mechanism for drug absorption from the intestine is for most drugs passive transfer, a few exceptions include

Factors influencing gastrointestinal absorption:

• Gastrointestinal motility
  .
• Splanchnic blood flow.
• Particle size and formulation.
• Physicochemical factors.

First pass metabolism

Drugs given by enteral administration may be subjected to significant

, and therefore, the amount of drug entering the systemic circulation following administration may vary significantly for different individuals and drugs. Rectal administration is not subject to extensive first pass metabolism.

See also

• Enteric (disambiguation)
• Feeding tube

References

Skin	Intradermal Subcutaneous Injector pen Transdermal implant	Organs	Intracavernous Intravitreal Intra-articular
Central nervous system	Intracerebral Intrathecal Epidural
Circulatory, musculoskeletal	Intravenous Intracardiac Intramuscular Intraosseous Intraperitoneal Nanocell injection Patient-controlled analgesia pump PIC line