Preparation method of tolvaptan tablet

Abstract

The invention discloses a preparation method of a tolvaptan tablet. The preparation method comprises the following steps: 1, mixing tolvaptan with high-substituted hydroxylpropyl cellulose according to a mass ratio of 1:0.2-0.6, crushing them, and sieving by a 60-100 mesh sieve; 2, dissolving throughs in a mixed solution of waterless ethanol and dichloromethane with a volume ratio of 1:1-4, carrying out spray drying to form powder, carrying out reduced pressure drying at 70-90DEG C until that the content of solvents residual in the sprayed powder is qualified; 3, crushing the sprayed powder, sieving by a 180-220 mesh sieve, accurately weighing the sprayed powder, lactose, microcrystalline cellulose and hydroxypropyl methylcellulose according to prescription amounts, uniformly mixing them, and adding a proper amount of water to prepare a soft material; and 4, sieving the soft material by a 15-25 mesh sieve, preparing a wet particle, drying the wet particle at 50-70DEG C until that the content of water in the wet particle is 2-4%, sieving the dried wet particle by a 15-25 mesh sieve, granulating, adding a prescription amount of magnesium stearate, uniformly mixing, and tabletting. The preparation method of the invention has the advantages of ingenious conception, low production cost, high in vitro dissolubility of the prepared tolvaptan tablet, and good biological availability and clinic curative effect of the tolvaptan tablet.

Description

technical field

[0001] The invention belongs to the technical field of chemical pharmacy and relates to a preparation method of tolvaptan tablet. Background technique

[0002] When the concentration of sodium ions in the blood plasma decreases, in order to maintain the balance of the concentration of sodium ions inside and outside the cells, extracellular fluid will enter the cells, so that the cells will swell. When brain cells swell, it can lead to various symptoms of hyponatremia. These include dizziness, weakness, headache, nausea, confusion, and reduced consciousness and seizures. Severe hyponatremia can lead to coma and death.

[0003] Tolvaptan (Tolvaptan, Chinese chemical name: N-[4-[7-chloro-5-hydroxy-2,3,4,5-tetrahydro-5-benzazepine

[0004] -1-formyl]-3-methylphenyl]-2-methylbenzamide) is a selective V2 vasopressin receptor antagonist that can be used to treat congestive heart failure, liver cirrhosis and antidiuretic hormone Hyponatremia due to hyposecretor...

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