A novel process for the preparation of codeinone and analogues thereof comprising the oxidation of a compound of formula,
1
or a salt thereof, wherein R
1
is lower alkyl or a group
2
wherein R
4
is lower alkyl, lower alkyl substituted by halogen or phenyl, phenyl or substituted phenyl; and R
2
is lower alkyl, allyl or lower alkyl substituted by cycloalkyl, characterised in that the oxidation is carried out in an acidic environment is disclosed.
Pharmaceutical formulation in the form of aqueous suspension
申请人:Rohto Pharmaceutical Co., Ltd.
公开号:US05334378A1
公开(公告)日:1994-08-02
A pharmaceutical formulation in the form of aqueous suspension which comprises an ion exchange resin carrying an active ingredient and a suspending agent, characterized in that the formulation further contains a basic or neutral amino acid or a salt thereof as a dispersion stabilizer.
Prolonged-release liquid type of pharmaceutical preparation comprising
申请人:Rohnto Pharmaceutical Co., Ltd.
公开号:US05368852A1
公开(公告)日:1994-11-29
The present invention provides a prolonged-release liquid type of pharmaceutical preparation prepared by coating a pharmaceutically active drug-ion exchange resin complex which was treated previously with an impregnating agent, with a water permeable diffusion barrier material, followed by suspending the coated complex in a solution containing preservatives. The formulation of the present invention does not develop the rupture of the diffusion barrier film even in a solution containing preservatives. Therefore the formulation of the present invention is a prolonged-release liquid type of pharmaceutical preparation which is stable and does not lose the controlled release of the active ingredient.
Opioid-Nornicotine Codrugs Combinations for Pain Management
申请人:Holtman Joseph R.
公开号:US20110112130A1
公开(公告)日:2011-05-12
The present invention relates to the field of pain management, and more particularly to synergistic codrugs comprising an opioid and nornicotine which have been combined to form a single chemical codrug entity. When the codrug is administered it produces a synergistic analgesic response to pain.
A solid dose composition containing a mixture of a cured, modified release-barrier coated methylphenidate-ion exchange resin complex-matrix and an uncoated methylphenidate-ion exchange resin complex is described. The barrier coated methylphenidate-ion exchange resin complex-matrix comprises methylphenidate complexed with a pharmaceutically acceptable ion-exchange resin to form the complex which is admixed with a polymer to form a methylphenidate-ion exchange resin complex-matrix, which is subsequently coated with a modified release coating. The modified coating contains polyvinyl acetate polymer and a plasticizer and is cured.