Bengal Drugs & Chemical Works Pharm. Ltd. Total of 2 brands are available from this manufacturer Bengal Drugs & Chemical Works Pharm. Ltd.Brands Manufactured by Bengal Drugs & Chemical Works Pharm. Ltd.Bentrimn (Suspension) 200 mgSulphamethoxazole + TrimethoprimBengal Drugs & Chemical Works Pharm. Ltd.Bentrimn (Suspension) 40 mg/5 mlSulphamethoxazole + TrimethoprimBengal Drugs & Chemical Works Pharm. Ltd.