Comparative Pharmacology
Head-to-head clinical analysis: SELSUN versus TOLAK.
Peer-Reviewed Evidence
Head-to-head clinical analysis: SELSUN versus TOLAK.
SELSUN vs TOLAK
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Selenium sulfide is an antifungal agent that inhibits the growth of Malassezia species by reducing selenium to elemental selenium, which is toxic to the fungus. It also reduces sebum production via unknown mechanisms.
TOLAK (tazarotene) is a retinoid prodrug that is converted to its active metabolite tazarotenic acid, which binds selectively to retinoic acid receptors (RARs) such as RARβ and RARγ; this modulates gene expression involved in cell proliferation, differentiation, and inflammation.
Apply 5-10 mL of 2.5% selenium sulfide lotion to affected areas of scalp, lather with water, leave on for 2-3 minutes, then rinse thoroughly. Use twice weekly for 2 weeks, then once weekly for maintenance.
Adults: 200 mg orally twice daily.
None Documented
None Documented
Not well defined due to minimal systemic absorption; topical application yields negligible plasma levels.
The terminal elimination half-life of fluorouracil is approximately 10-20 minutes due to rapid catabolism by dihydropyrimidine dehydrogenase. Clinically, this short half-life necessitates continuous infusion for sustained systemic exposure.
Selenium sulfide is minimally absorbed; absorbed portions are excreted renally (approx. 80-90%) and fecally (10-20%).
Tolak (fluorouracil) is primarily eliminated via metabolism; less than 10% is excreted unchanged in urine. Fecal excretion accounts for approximately 10-20% of the administered dose.
Category C
Category C
Antifungal/Antiseborrheic
Antifungal