Abstract: This invention relates to the method for treating the form of alopecia commonly known as "male pattern baldness" which comprises regular topical application to the affected areas of the human scalp of a composition containing as at least one of its active ingredients 6-amino-1,2-dihydro-1-hydroxy-2-imino-4-piperidinopyrimidine. It also encompasses the aforesaid compound itself for use as a therapeutic agent to arrest and reverse male pattern alopecia.

Abstract: This invention relates to a process for stimulating the growth of mammalian hair comprising the application to mammalian skin of a compound of the formula: ##STR1## wherein R.sub.1 is a moiety selected from the group consisting of moieties of the formula ##STR2## wherein R.sub.3 and R.sub.4 are selected from the group consisting of hydrogen, lower alkyl, lower alkenyl, lower aralkyl, and lower cycloalkyl, and taken together R.sub.3 and R.sub.4 may be a heterocyclic moiety selected from the group consisting of aziridinyl, azetidinyl, pyrrolidinyl, piperidino, hexahydroazepinyl, heptamethylenimino, octamethylenimino, morpholino, and 4-lower-alkylpiperazinyl, each of said heterocyclic moieties having attached as substituents on the carbon atoms 0-3 lower alkyl groups, hydroxy or alkoxy wherein R.sub.