Formulation and evaluation of press coated tablets of salbutamol sulphate for time controlled release

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M. D. Wasimul Hasan
Komuravelly Someshwar
Patha Chaitanya
Abdul Bari Mohd
Ande Pratyusha
Vattikuti Uma Maheshwara Rao


The objective of the present study was to formulate and evaluate a press coated pulsatile drug delivery system of salbutamol
sulphate in order to attain a time controlled release for treatment of nocturnal asthma. The core was prepared by direct
compression, while press coating technique was used in coating the outer layer there by preparing a press coated tablet. The
immediate release core formulations comprised of salbutamol sulphate and disintegrants like crospovidone, croscarmellose
sodium and sodium starch glycolate in different ratios with the drug. The outer coat formulations were prepared using a
hydrophilic (HPMC) and hydrophobic (EC) polymer of similar viscosity. The polymers were reviewed individually for
their influence on lag time further obtaining the lag time using polymer combinations were assessed by employing central
composite design. All the preliminary trials were evaluated for various post compression parameters along with the dissolution
study that was performed using USP paddle method at 50 rpm in 0.1 N HCl and phosphate buffer pH 6.8. The formulation
containing 300 mg of EC N50 and 75‑100 mg of HPMC E50 may be regarded as the minimum quantity required in outer
press coat so as to attain a predetermined lag time of 6 h.
Key words: Central composite design, ethylcellulose, hydroxypropyl methylcellulose, press coat, salbutamol sulphate, time controlled release


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Hasan, M. D. W., Someshwar, K., Chaitanya, P., Mohd, A. B., Pratyusha, A., & Rao, V. U. M. (2014). Formulation and evaluation of press coated tablets of salbutamol sulphate for time controlled release. Asian Journal of Pharmaceutics (AJP), 8(3).


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