Nonane and decane diazabicyclic derivatives having homopiperazine as main ring, having affinity for the opioidergic μ and/or δ and/or k receptors and/or for all their receptorial subclasses, with central and/or peripheral activity, having formula (I), the isomeric forms and their mixtures included, wherein one or more atoms are in the corresponding isotopic forms: wherein: n is an integer equal to 1 or 2; one of the substituents R and R1 of the nitrogen atoms of the diazabicyclic ring is a —C(O)—RB group, wherein RB is a C1-C10 alkyl group, linear or branched when possible, the other remained substituent of R and R1 has the meanings reported in the description.