This article critiques the dosages recommended by Dr. Orentreich for alopecia treatment, suggesting higher initial dosages of prednisone and intralesional steroids may be more effective based on the author's experiences.
This study found that a significant portion of counterfeit drugs seized among bodybuilders did not match their labels, with many containing undeclared anabolic steroids or other unexpected active ingredients.
16 citations
,
July 2000 in “Dermatologic surgery” This paper contains author contact information and disclosures without reporting new research findings or results.
25 citations
,
June 2002 in “Steroids” This study examined 4-azasteroids using 13C-NMR spectroscopy, detailing the NMR spectrum assignments and reporting a new molecular complex of finasteride with dioxane.
136 citations
,
March 1996 in “Journal of the American Chemical Society” This study explains finasteride's high potency and specificity as a mechanism-based inhibitor for treating benign prostatic hyperplasia by detailing its interaction with human type 2 steroid 5α-reductase.
46 citations
,
September 2014 in “Steroids” This review suggests that brassinosteroids may have similar biological activities in both plants and other organisms, prompting further exploration of steroid regulation mechanisms across different life forms.
20 citations
,
June 1995 in “Tetrahedron Letters” This study reported that newly synthesized phenanthridin-3-one derivatives effectively inhibit human steroid 5-α-reductase.
11 citations
,
September 2020 in “Steroids” This study developed a new method using liquid chromatography-tandem mass spectrometry to measure multiple steroid hormones in hair, requiring significantly fewer strands than previous methods, with high accuracy and precision.
101 citations
,
November 1992 in “Archives of Dermatology” In this study, tapering prednisone followed by 2% topical minoxidil helped limit hair loss in some patients with alopecia areata, with 30% to 47% showing over 25% hair regrowth initially.
2 citations
,
May 2021 in “Molecules” This study reports that the metanephrine content was significantly higher in patients with alopecia areata compared to those without the condition.
451 citations
,
March 2005 in “Endocrine Reviews” This paper discusses the role of steroid sulfatase in hormone-dependent tumors and highlights the development of potent inhibitors, noting the commencement of a phase I trial for one inhibitor in postmenopausal breast cancer patients.
402 citations
,
August 2011 in “Cancer research” This study found that castration-resistant prostate cancers resistant to CYP17A1 inhibitors may still depend on steroids and could respond to therapies targeting de novo intratumoral steroid synthesis.
82 citations
,
August 2006 in “Pharmacology, Biochemistry and Behavior” This review proposes focusing on relationships between neuroactive steroids and psychiatric disorder symptoms, rather than relying on traditional disorder classifications, and reports no new clinical findings.
56 citations
,
February 2006 in “American journal of physiology. Cell physiology” This study observed that in hormone-starved prostate cancer cells, the androgen 5alpha-dihydrotestosterone rapidly induces matriptase activation and shedding, which involves androgen receptor signaling and requires both transcription and protein synthesis.
55 citations
,
July 1999 in “Clinics in Sports Medicine” This review discusses recent data on the use of anabolic-androgenic steroids and other steroid compounds and reports no new clinical results.
53 citations
,
June 1993 in “Proceedings of the National Academy of Sciences of the United States of America” This study identified LY191704 as a specific noncompetitive inhibitor of human 5 alpha-reductase type 1, which may be useful in treating endocrine disorders related to DHT overproduction.
50 citations
,
July 2014 in “International Journal of Clinical Pharmacology and Therapeutics” This study found that both topical and oral finasteride significantly reduced plasma DHT after one week, with lower finasteride plasma exposure for the topical formulation.
47 citations
,
June 2009 in “Journal of Biological Chemistry” This study found that finasteride competitively inhibits the enzyme AKR1D1 with low micromolar affinity but does not act as a mechanism-based inactivator.
32 citations
,
October 2003 This review reports that 100 mg/day spironolactone improved hair growth more than placebo and was more effective in reducing hair growth than finasteride and low-dose cyproterone acetate, but its effectiveness for acne remains unclear due to small sample sizes.
30 citations
,
October 2020 in “Nature Communications” This study provides the first crystal structure of the human SRD5A2 enzyme, revealing key insights into its function and inhibition which may aid future drug development.
29 citations
,
January 1996 in “Journal of Pharmaceutical Sciences” This study developed a theoretical model that suggests finasteride may completely inhibit 5AR type 2, but not sufficiently suppress type 1, leading to only partial reduction of dihydrotestosterone at clinical doses.
22 citations
,
October 2001 in “Biochemical Pharmacology” This study found that GI198745 acts as a time-dependent inhibitor of rat 5α-reductase type 2 but a rapid-equilibrium inhibitor of type 1, potentially making it more effective than finasteride in preventing rat prostate growth.
15 citations
,
October 2016 in “Steroids” This study developed and validated a label-free assay using LC-MS to screen for S5αR inhibitors, identifying Thai herbal extracts, Impatiens balsamina L. and Curcuma longa L., as promising sources.
14 citations
,
April 2021 in “Biology” This study found that ethanol extract of Tubtim Chumphae rice bran downregulates SRD5A gene expression, similarly to finasteride, suggesting potential use as an anti-hair loss product.
14 citations
,
February 2018 in “Psychoneuroendocrinology” This study found that male 5α-reductase 2 knockout mice showed deficits in social dominance behaviors and reduced dopamine receptor binding in a brain region related to social ranking.
13 citations
,
January 2017 in “Chemical & Pharmaceutical Bulletin” This study found that a synthetic avicequinone C analogue, 5e, was significantly more potent in inhibiting steroid 5α-reductase type 1 activity in human keratinocytes compared to the original isolated compound.
11 citations
,
December 2018 in “Assay and Drug Development Technologies” This review highlights the challenges in screening for steroid 5 alpha-reductase inhibitors and discusses significant variability in the effectiveness of finasteride and dutasteride, calling for standardized testing methods to develop safer, more specific inhibitors from herbal preparations.
11 citations
,
May 2010 in “Journal of the South African Veterinary Association” This case report describes how a treatment with mycophenolate mofetil and prednisone may be effective in managing autoimmune subepidermal blistering dermatosis in dogs while allowing for steroid reduction.
9 citations
,
October 1993 in “The Journal of Clinical Pharmacology” Finasteride doesn't affect antipyrine metabolism, so interactions with cytochrome P-450 enzyme drugs are unlikely.
8 citations
,
March 2020 in “Metabolites” This study found differences in urinary androgen and estrogen concentrations between male pattern baldness patients treated with finasteride and healthy controls, suggesting potential biomarkers for post-finasteride syndrome.