In the present study, 1,8-naphthyridine-3-carboxylic acid derivatives (5a1, 5a2, 5b1, and 5b2) were
designed, synthesized, and screened for their in vitro H1-antihistaminic activity. H1R inhibitory activity
of the synthesized derivatives was calculated by the modified Van Arman technique, histamine-induced
bronchoconstriction in guinea pigs. A good bronchorelaxant effect of compounds was observed in
histamine-contracted guinea pig tracheal chain through H1-receptor antagonism. In addition, the
hypothetically resulted compounds are checked for their reliability on other in silico drug designing
online web services like SwissADME predictor. In silico ADMET analysis results show that all the
derivatives had negligible toxicity, good absorption, and solubility profile. These compounds may serve
as possible lead for establishing safe and effective antihistaminic agent(s).