Thursday, May 22, 2014

Methods of castration (part 4)


4- Leuprorelin
Leuprorelin (INN) or leuprolide acetate (USAN) is a GnRH analog. Proper Sequence: Pyr-His-Trp-Ser-Tyr-D-Leu-Leu-Arg-Pro-NHEt (Pyr = L-Pyroglutamyl)
Mode of action
Leuprolide acts as an agonist at pituitary GnRH receptors. By interrupting the normal pulsatile stimulation of, and thus desensitizing, the GnRH receptors, it indirectly downregulates the secretion of gonadotropins luteinizing hormone (LH) and follicle-stimulating hormone (FSH), leading to hypogonadism and thus a dramatic reduction in estradiol and testosterone levels in both sexes.

Clinical use
An LH-RH (GnRH) analog, leuprolide may be used in the treatment of hormone-responsive cancers such as prostate cancer or breast cancer, estrogen-dependent conditions (such as endometriosis or uterine fibroids), to treat precocious puberty, and to control ovarian stimulation in In Vitro Fertilization (IVF). It is considered a possible treatment for paraphilias.

Leuprolide has been tested as a treatment for reducing sexual urges in pedophiles and other cases of paraphilia. High doses are sometimes used to chemically castrate sex offenders.

Leuprolide is also under investigation for possible use in the treatment of mild to moderate Alzheimer's disease.

Leuprolide is also used to treat chronic adrenal disease in ferrets.[citation needed] It also used for treatment of steroid abuse.[citation needed]

Leuprolide, along with triptorelin and goserelin, are often used to delay puberty in transgender youth until they are old enough to begin hormone replacement therapy. They are also sometimes used as superior alternatives to anti-androgens like spironolactone and cyproterone acetate for suppressing testosterone production in trans women.

Lupron protocol
A 2005 paper suggested leuprolide as a possible treatment for autism,[9] the hypothetical method of action being the now defunct hypothesis that autism is caused by mercury, with the additional unfounded assumption that mercury binds irreversibly to testosterone and therefore leuprolide can help cure autism by lowering the testosterone levels and thereby mercury levels. However, used on children or adolescents it could cause disastrous and irreversible damage to sexual functioning, and there is no scientifically valid or reliable research to show its effectiveness in treating autism. This use has been termed the "Lupron protocol" and Mark Geier, the proponent of the hypothesis, has frequently been barred from testifying in vaccine-autism related cases on the grounds of not being sufficiently expert in that particular issue and has had his medical license revoked. Medical experts have referred to Geier's claims as "junk science".

Approvals
Lupron Injection (5 mg/ml for daily subcutaneous injection) was first approved by the FDA for treatment of advanced prostate cancer on April 9, 1985.
Lupron Depot (7.5 mg/vial for monthly intramuscular depot injection) was first approved by the FDA for palliative treatment of advanced prostate cancer on January 26, 1989, and subsequently in 22.5 mg/vial and 30 mg/vial for intramuscular depot injection every 3 and 4 months, respectively. 3.75 mg/vial and 11.25 mg/vial dosage forms were subsequently approved for subcutaneous depot injection every month and every 3 months, respectively for treatment of endometriosis or fibroids. 7.5 mg/vial, 11.25 mg/vial, and 15 mg/vial dosage forms were subsequently approved for subcutaneous depot injection for treatment of children with central precocious puberty.
Viadur (72 mg yearly subcutaneous implant) was first approved by the FDA for palliative treatment of advanced prostate cancer on March 6, 2000. Bayer will fulfill orders until current supplies are depleted, expected by the end of April 2008
Eligard (7.5 mg for monthly subcutaneous depot injection) was first approved by the FDA for palliative treatment of advanced prostate cancer on January 24, 2002, and subsequently in 22.5 mg, 30 mg, and 45 mg doses for subcutaneous depot injection every 3, 4, and 6 months, respectively.
Leupromer® 7.5 ( 7.5 mg, One month depot for subcutaneous injection) is the second In-situ forming injectable drug in the world. It is used for palliative treatment of advanced prostate cancer, endometriosis and fibroids. It was approved by The Ministry of Health and Medical Education Of Iran.

Leuprolide acetate is marketed by Bayer AG under the brand name Viadur, by Sanofi-Aventis under the brand name Eligard, and by TAP Pharmaceuticals (1985–2008), by Varian Darou Pajooh under the brand name Leupromer and Abbott Laboratories (2008-current) under the brand name Lupron. It is available as a slow-release implant or subcutaneous/intramuscular injection.

In the UK and Ireland, leuprorelin is marketed by Takeda UK as Prostap SR (one-month injection) and Prostap 3 (three-month injection).

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