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Solifenacin succinate is a quinuclidine and tetrahydroisoquinoline derivative and selective M3 muscarinic antagonist. It is used as a urological agent in the treatment of overactive bladder[1].

M3 muscarinic receptor is a muscarinic acetylcholine receptor encoded by the human gene CHRM3. Muscarinic M3 receptors are involved in various cellular responses, including breakdown of phosphoinositides, inhibition of adenylate cyclase and modulation of potassium channels through the action of G proteins[2].

In vitro: In radioligand receptor binding assay, the Kivalues of solifenacin for human muscarinic M1, M2, M3, M4and M5receptors were 26, 170, 12, 110 and 31 nM, respectively. In isolated rat urinary bladder, solifenacin competitively antagonized carbachol-induced contractions, with a pA2value of 7.44±0.09[3].In bladder smooth muscle cells and salivary gland cells isolated from rats, solifenacin and the other antimuscarinic drugs inhibited carbachol-induced increases in intracellular Ca2+levels in a concentration-dependent manner. ThepKi was 8.12for bladder smooth muscle cells, 3.6-fold more potent than that for salivary gland cells (pKi=7.57) [1].

In vivo: In anesthetized rats, solifenacin dose-dependently inhibited carbachol-induced intravesical pressure elevation and salivary secretion, and exhibited selectivity (3.7- to 6.5-fold) for urinary bladder over salivary gland [1]. In anesthetized rats, solifenacin and oxybutynin increased the maximum bladder capacity in a dose-dependent manner and also decreased the maximum intravesical pressure [3].In healthy young men, multidose study evaluated doses. In the single-dose of solifenacin succinate (5-, 10-, 20-, and 30-mg), mean time to maximal concentration and elimination half-life ranged from 3.3 to 4.8 and from 40.2 to 57.6 hours, respectively.In the multidose study, the ranges were 2.9 to 5.8 and 45.0 to 64.8, respectively. The single-dose administration was well tolerated. The common adverse events were dry mouth, blurred vision, and headache [4].

Clinical trials: In this phase 3 trial in patients with symptoms related to overactive bladder, treatment with solifenacin (5 mg or 10 mg, once daily) significantly improved all the major symptoms of overactive bladder including urgency, frequency and incontinence. Solifenacin (10 mg) decreased the frequency of nocturia. Solifenacin therapy has been associated with a favorable tolerability profile and low incidence of dry mouth, especially at the 5 mg starting dose [5].

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