Dutasteride
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Dutasteride
Avodart; combined with tamsulosin as Jalyn
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Summary
Classes
Common uses
Benign prostatic hyperplasia0, Androgenetic alopecia (off-label, more potent than finasteride)0
Pharmacy
Starting dose
0.5 mg PO once daily
Preparations
0.5 mg capsules
US FDA Max
0.5 mg/d
Pharmacology
Routes
Oral
Onset
Prostate volume reduction over 6-12 months
Duration
24 hours; tissue effects persist weeks
Half-life
~5 weeks (much longer than finasteride's ~6 hours)[1]
Bioavailability
~60% (oral)[1]
Pregnancy
Pregnant individuals should not handle dutasteride capsules (skin absorption risk through intact capsule); can cause hypospadias in male fetus.[citation needed]
Legal status
Rx-only in US
Purported mechanism
Dutasteride inhibits both type I (skin, hepatic) and type II (prostatic) 5α-reductase, achieving >90% serum DHT suppression compared with finasteride's ~70%; the dual inhibition translates to greater prostate volume reduction but a similar overall clinical effect in BPH.0 The long half-life means blood donation should be deferred for 6 months after the last dose (per FDA labeling) to prevent fetal exposure in a pregnant transfusion recipient. Post-finasteride/dutasteride syndrome (persistent sexual and mood effects after discontinuation) is a controversial but recognized clinical concern[1].
References
- ↑ 1.0 1.1 1.2 FDA Prescribing Information, Avodart (dutasteride), GlaxoSmithKline, current revision. https://www.accessdata.fda.gov/drugsatfda_docs/label/2014/020180s045lbl.pdf