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Glossary Half-Life

Half-life refers to the time required for the concentration of a substance, such as a drug or hormone, to reduce to half its initial value. In the context of hair loss and hair biology, understanding the half-life of hormones like dihydrotestosterone (DHT) is crucial, as prolonged exposure to elevated levels can contribute to conditions like androgenetic alopecia. Key distinguishing characteristics of half-life include its dependence on metabolic processes and the implications it has for treatment efficacy and timing in hair loss therapies.

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community Dutasteride half life - conflicting information

9 upvotes 2 years ago

The half-life of Dutasteride is commonly stated as around 5 weeks, but some sources suggest it is 170 hours for men aged 20–49, with further information indicating it varies from 3 days to 5 weeks depending on the dose. The user is seeking clarity on these conflicting figures.

community Why do we take dutasteride every single day when its half-life is 3-5 weeks?

in Finasteride/Dutasteride 73 upvotes 4 months ago

Dutasteride is often taken daily despite its long half-life because consistent dosing maintains optimal serum levels for effective DHT suppression. Some users report success with less frequent dosing, such as three times a week, but effectiveness can vary based on individual response and professional advice.

community Dutasteride actually has different half lives depending on dose

in Research/Science 37 upvotes 1 year ago

Dutasteride's half-life varies with dosage, and lower doses can be effective with fewer side effects compared to finasteride. Some users report different side effects with dutasteride and finasteride, and extreme dosages of dutasteride are unnecessary and potentially harmful.

community 3 and a half month progress pic

260 upvotes 1 year ago

The user shared a 3.5-month hair regrowth update using finasteride, 5% topical minoxidil, micro-needling, and keto shampoo, along with lifestyle changes like reducing stress and improving diet. They encourage others to stay committed to their regimen despite initial slow progress.

community Why do you take finasteride instead of dutasteride and also vice versa

in Finasteride/Dutasteride 26 upvotes 9 months ago

Finasteride is preferred for its shorter half-life and FDA approval, while dutasteride is seen as more effective but not FDA-approved for hair loss. Many combine these with minoxidil for improved results, though side effects and effectiveness vary.

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Research

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research The Pharmacokinetics of 2.5- to 10-mg Oral Doses of Minoxidil in Healthy Volunteers

25 citations , February 1989 in “The Journal of Clinical Pharmacology”

This document studied minoxidil in healthy volunteers. Minoxidil is quickly absorbed and eliminated from the body.

research Bioequivalance of single oral administration of finasteride tablet and capsule in healthy volunteers

January 2004

This study found that the finasteride tablet and capsule are bioequivalent to the control finasteride tablet in healthy volunteers.

The Effect of St. John's Wort on the Pharmacokinetics, Metabolism, and Biliary Excretion of Finasteride and Its Metabolites in Healthy Men

research The effect of St. John’s wort on the pharmacokinetics, metabolism and biliary excretion of finasteride and its metabolites in healthy men

33 citations , November 2008 in “European Journal of Pharmaceutical Sciences”

This study found that St. John's wort treatment for two weeks induced finasteride metabolism and reduced its plasma exposure in healthy men.

research Progesterone, neurosteroids, and the hormonal basis of catamenial epilepsy

30 citations , February 2003 in “Annals of Neurology”

This editorial discusses the hormonal basis of catamenial epilepsy, particularly focusing on the roles of progesterone and neurosteroids, and presents no new research findings.

research Sublingual tofacitinib for alopecia areata: a roll‐over pilot clinical trial and analysis of pharmacokinetics

9 citations , May 2021 in “International Journal of Dermatology”

In this study, sublingual tofacitinib achieved a longer estimated half-life than oral administration in treatment-resistant alopecia areata patients, potentially supporting daily dosing; overall treatment response was modest.

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Learn

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learn Scalp Micropigmentation

How soon can I resume normal activities after scalp micropigmentation? Providers commonly say normal daily activity can resume within a day of scalp micropigmentation, with about half restricting exercise for 5 to 10 days and about half saying full activity waits 2 to 3 weeks. Follow the aftercare your own practitioner gives you.

learn Dutasteride

Heavy duty finasteride that comes with higher risks

learn Overview

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