Abstract: The invention provides novel 2-adamantyl hydrazine derivatives of the general formula A ##STR1## In this formula R.sub.1 is hydrogen or a lower alkyl group of 1-4 carbon atoms; R.sub.2 and R.sub.3 are the same or different and are each hydrogen, an unsubstituted or substituted radical being a lower alkyl of 1-4 carbon atoms, a lower alkanoic acid radical of 2-4 carbon atoms or a lower alkyl ester thereof, adamantyl, aryl, aralkyl, in which the alkyl moiety has from 1-4 carbon atoms or an unsubstituted or substituted heterocyclic radical of aromatic character; or R.sub.2 and R.sub.3 together with the nitrogen atom to which they are attached form an unsubstituted or substituted non-aromatic cyclic radical.The invention further provides pharmaceutically acceptable acid addition salts of the above compounds.Several methods of preparation of the new compounds are described.

Abstract: The invention provides novel 1- or 2-adamantylmethyl hydrazines of the general formula A ##STR1## In this formula Ad is 1- or 2-adamantyl, R.sub.1 and R.sub.2 are the same or different and are each hydrogen or a lower unsubstituted or substituted alkyl group of 1-4 carbon atoms; R.sub.3 and R.sub.4 are the same or different and are each hydrogen, an unsubstituted or substituted radical being a lower alkyl group of 1-4 carbon atoms a lower alkanoic acid radical of 2-4 carbon atoms or a lower alkyl ester thereof, adamantyl, aryl, aralkyl in which the alkyl moiety has 1-4 carbon atoms or an unsubstituted or substituted heterocyclic radical of aromatic character; or R.sub.3 and R.sub.4 together with the nitrogen atom to which they are attached form a cyclic radical or non-aromatic character.The invention further provides pharmaceutically acceptable acid addition salts of the above compounds.Several methods of preparation of the new compounds are described.