Double blind, placebo controlled evaluation of the safety, pharmacokinetic properties and pharmacodynamic effects of intranasal PT 141, a melanocortin receptor agonist, in healthy males and patients with mild to moderate erectile dysfunction Peptides for Erectile Dysfunction: Understanding PT 141 and Practical Options Evaluation of the safety, pharmacokinetics and pharmacodynamic effects of subcutaneously administered PT 141, a melanocortin receptor agonist, in healthy male subjects and in patients with an inadequate response to Viagra International Journal Is PT 141 Safe? Side Effects, Warnings & Who Should Avoid It PT 141 Side Effects: What Helps