Cetirizine and pseudoephedrine sustained-release capsule and preparation method thereof

The invention discloses a cetirizine pseudoephedrine slow release capsule. Cetirizine hydrochloride is prepared to quick release pellets and pseudoephedrine hydrochloride is prepared to slow release pellets, in accordance with the weight proportion that each 1000 preparations contain 5g of cetirizine hydrochloride and 120g of pseudoephedrine hydrochloride, the two pellets are uniformly mixed and encapsulated; or the two pellets are encapsulated respectively in proportion. The quick release part of the cetirizine hydrochloride and the slow release part of the pseudoephedrine hydrochloride are synthesized together subsequent to being prepared to the pellets respectively, so as to prepare the capsule with two different medicine-releasing speeds, the medicine-releasing speed of each pellet is uniform and the medicine effect is steady. The capsule has the advantages of even and extensive distribution of the medicine in vivo subsequent to the administering, sufficient absorption of the medicine, small stimulation to gastrointestinal tracts and good reproducibility of the medicine-releasing rule, and improves, while maintaining the properties of rapid effecting and long half-life of the cetirizine, the pharmacokinetic properties of the pseudoephedrine hydrochloride to administer twice per day instead of having to administer four times per day, so that both reach the optimal cooperative curative effect.