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[DOI] [PMC free article] [PubMed] [Google Scholar] 4.Craik D.J., Fairlie D.P., Liras S., Price D
Treating that vulnerability with proper storage is what separates researchers who get consistent results from those who wonder why their peptides stopped working halfway through a protocol
[6] First-line pharmacological treatments include phosphodiesterase type 5 (PDE5) inhibitors, which are licensed, well-studied medications: Sildenafil (Viagra): Typically effective within 30-60 minutes, lasting 4-6 hours [7] Tadalafil (Cialis): Longer duration of action (up to 36 hours), also available as daily low-dose formulation [8] Vardenafil (Levitra): Similar efficacy to sildenafil with slightly different pharmacokinetics Avanafil (Spedra): Take approximately 30 minutes before sexual activity
95% CI, 0.14-0.69
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