Drug Name Effexor

Many drugs exhibit a linear relationship between plasma concentration and dose within the therapeutic range (dose-linear kinetics; (A); note different scales on ordinate).
However, their antipsychotic effects are qualitatively indistinguishable. As structural analogues of the phenothiazines, thioxanthenes (e. g. , chlorprothixene, flupentixol) possess a central nucleus in which the N atom is replaced by a carbon linked via a double bond to the side chain. Unlike the phenothiazines, they display an added thymoleptic activity.

 

The absolute configuration, as determined by certain rules, is described by the prefixes S and R. In some compounds, designation as the D- and L-form is possible by reference to the structure of D- and L-glyceraldehyde. For drugs to exert biological actions, contact with reaction partners in the body is required.
Even after inhalation, effective amounts can reach the systemic circulation and cause side effects (e. g. , palpitations, tremulousness, restlessness, hypokalemia). During chronic administration, the sensitivity of bronchial musculature is likely to decline. d) Theophylline belongs to the methylxanthines.