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Medications delivered to the distal one-third of the rectum at least partially avoid the "first pass effect" through the liver, which allows for greater bio-availability of many medications than that of the oral route. Rectal mucosa is highly vascularized tissue that allows for rapid and effective absorption of medications. [15]
Intravascular administration does not involve absorption, and there is no loss of drug. [4] The fastest route of absorption is inhalation. [5] Absorption is a primary focus in drug development and medicinal chemistry, since a drug must be absorbed before any medicinal effects can take place. Moreover, the drug's pharmacokinetic profile can be ...
An injection is considered a form of parenteral drug administration; it does not involve absorption in the digestive tract. This allows the medication to be absorbed more rapidly and avoid the first pass effect. There are many types of injection, which are generally named after the body tissue the injection is administered into.
Systemic administration is a route of administration of medication, nutrition or other substance into the circulatory system so that the entire body is affected. [1] Administration can take place via enteral administration (absorption of the drug through the gastrointestinal tract) [ 2 ] or parenteral administration (generally injection ...
If we compare the two different dosage forms having same active ingredients and compare the two drug bioavailability is called comparative bioavailability. [18] Although knowing the true extent of systemic absorption (referred to as absolute bioavailability) is clearly useful, in practice it is not determined as frequently as one may think.
[1] [2] The effect is most associated with orally administered medications, but some drugs still undergo first-pass metabolism even when delivered via an alternate route (e.g., IV, IM, etc.). [3] During this metabolism, drug is lost during the process of absorption which is generally related to the liver and gut wall. The liver is the major ...
However, the first well-known attempt to inject drugs into the body was a 1667 attempt to inject a solution of opium into a dog, and some had suspected that parenteral administration of drugs may work better based on the practise of rubbing opium and other drugs into sores or cuts on the skin for the purpose of causing systemic absorption and ...
Drugs may be modified to be slowly activated by the body, or be absorbed slowly by the body. Many are dissolved in an organic oil, as the compound is lipophilic due to the addition of functional groups to provide slow action. An example of this is adding a functional group such as decanoate. [2]
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