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Intramuscular injection, often abbreviated IM, is the injection of a substance into a muscle. In medicine , it is one of several methods for parenteral administration of medications. Intramuscular injection may be preferred because muscles have larger and more numerous blood vessels than subcutaneous tissue, leading to faster absorption than ...
The term injection encompasses intravenous (IV), intramuscular (IM), subcutaneous (SC) and intradermal (ID) administration. [35] Parenteral administration generally acts more rapidly than topical or enteral administration, with onset of action often occurring in 15–30 seconds for IV, 10–20 minutes for IM and 15–30 minutes for SC. [36]
Tritiated estradiol radioactivity in blood with a single intramuscular injection of 1.5 to 2.8 μg tritiated estradiol in aqueous solution in four women. [1] Peak blood radioactivity occurred within 15 minutes in three of the women and in the remaining woman after 2 hours. [1] Source: Davis et al. (1963). [1]
Estradiol can be taken by a variety of different routes of administration. [10] These include oral, buccal, sublingual, intranasal, transdermal (gels, creams, patches), vaginal (tablets, creams, rings, suppositories), rectal, by intramuscular or subcutaneous injection (in oil or aqueous), and as a subcutaneous implant. [10]
[1] [2] It contained 1 mg E2 and 9 mg E2-EN in oil solution and was intended for administration by intramuscular injection. [1] [2] A single intramuscular injection of E2/E2-EN (1 mg/9 mg) has been found to result in a 10-fold increase in estradiol excretion on the 2nd day post-injection (due to the 1 mg short-acting E2 component).
Absorption by some other routes, such as intravenous therapy, intramuscular injection, enteral nutrition, is even more straightforward and there is less variability in absorption and bioavailability is often near 100%. Intravascular administration does not involve absorption, and there is no loss of drug. [4]
Needle insertion angles for 4 types of injection: intramuscular, subcutaneous, intravenous, and intradermal. Injections are classified in multiple ways, including the type of tissue being injected into, the location in the body the injection is designed to produce effects, and the duration of the effects.
Estradiol valerate is usually used in the treatment of advanced prostate cancer in men at a dosage of 30 mg or more every 1 to 2 weeks by intramuscular injection. [13] In transgender women, estradiol valerate given by intramuscular injection is usually used at a dosage of 5 to 20 mg, but up to 30 to 40 mg, once every 2 weeks.
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