The present invention concerns novel amidines derivatives of 2-heteroaryl-quinazoline and quinolines of general formula (I), to a process for their preparation, to their pharmaceutical compositions and to the use of these compounds, salts and solvates thereof, along with the corresponding pharmaceutical compositions, for the treatment of pain and inflammatory disorders. Compounds of this invention are extremely potent analgesics, suitable for the treatment of both inflammatory and neuropathic pain. Particularly for the treatment of neuropathic pain the compounds of the invention have been proved largely superior to the standards currently in the clinical use. These compounds are not acting through inhibition of COX or NOS enzymes but are effective in inhibiting inflammatory cytokine production induced by inflammatory stimuli.