OPTIMIZATION AND ACESSING THE INFLUENCE OF XANTHAN GUM, EFFERVESCENT COMPONENTS AND HARDNESS ON FLOATATION BEHAVIOR AND DRUG RELEASE OF GASTRO-FLOATING CAPTOPRIL TABLET - Choiri, Syaiful; Department of Pharmacy, Faculty of Pharmacy, Setia Budi University, Jln. Let.Jen. Sutoyo, Surakarta, Central Java, Indonesia, 57127 (Faculty of Pharmacy Universitas Gadjah Mada, Yogyakarta, Skip Utara, 55281, Indonesia, 2014)