Drug Name Zyban

Antidiuretic Hormone (ADH) and Derivatives (B) ADH, a nonapeptide, released from the posterior pituitary gland promotes reabsorption of water in the kidney. This response is mediated by vasopressin receptors of the V2 subtype. ADH enhances the permeability of collecting duct epithelium for water (but not for electrolytes).
The initiation of an epileptic attack involves “pacemaker” cells; these differ from other nerve cells in their unstable resting membrane potential, i. e. , a depolarizing membrane current persists after the action potential terminates. Therapeutic interventions aim to stabilize neuronal resting potential and, hence, to lower excitability.

 

In the obese, the maximum binding possible (plateau of curve) is displaced downward, indicative of the reduction in receptor numbers. Also, at low insulin concentrations, there is less binding of insulin, compared with the control condition. For a given metabolic effect a certain number of receptors must be occupied.
Sulfonamides structurally resemble p-aminobenzoic acid (PABA), a precursor in bacterial DHF synthesis. As false substrates, sulfonamides competitively inhibit utilization of PABA, hence DHF synthesis. Because most bacteria cannot take up exogenous folate, they are depleted of DHF. Sulfonamides thus possess bacteriostatic activity against a broad spectrum of pathogens.