Abstract: Granules for controlled release of Tamsulosin, the granules including Tamsulosin and a carrier matrix. The carrier matrix includes a) 2 to 25% by weight of an alginate and b) 30 to 70% by weight of a macromolecular substance selected from the group consisting of: methacrylic acid/ethyl acrylate 1:1 copolymer, methacrylic acid/methyl methacrylate 1:1 or 1:2 copolymers, aminoalkyl methacrylate copolymer, vinyl acetate/crotonic acid copolymer, polyvinyl acetate phthalate, ethylene-vinyl acetate, cellulose acetate phthalate, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, carrageenan, crosslinked chitosan, polyethylene-vinyl acetate, poly-L-lactic acid, xanthan gum, polyvinyl acetate and mixtures thereof. The carrier matrix further includes 10 to 50% by weight of a hydrophobic substance selected from the group consisting of: glycerol behenate, glyceryl monostearate, wax, mono-, di- and trisubstituted glycerides, calcium stearate and mixtures thereof.