A cyclic peptide of the structural formula: ##STR00001## or a pharmaceutically acceptable salt thereof, wherein R.sub.1, R.sub.2, R.sub.3, R.sub.5, R.sub.6, m, n and p are as defined. Further provided are compositions for treatment of sexual dysfunction in mammals, including male sexual dysfunction, such as erectile dysfunction, and female sexual dysfunction, by administration of a cyclic peptide including a C-terminus --OH group. Routes of administration include injection, oral, urethral, vaginal, nasal and mucosal administration.

 
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> Residual solvent extraction method and microparticles produced thereby

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