Drug-containing multilayer film and method for forming the same

A method for forming a drug-containing multilayer film, comprising the following manner (a) or (b):

• the manner (a), comprising:
• (i) drying a first solution to form a film to form a drug-containing layer;
• and
• (ii) drying a second solution to form a film over a surface of the drug-containing layer to form an anti-adhesion layer;
• the manner (b), comprising:
• (i′) drying a second solution to form a film to form an anti-adhesion layer;
• and
• (ii′) drying a first solution to form a film over the anti-adhesion layer to form a drug-containing layer,
• wherein a solute of the first solution comprises a first polymer material and a drug, and the first polymer material comprises at least one selected from the group consisting of:
• polylactic acid (PLA) and polyethylene glycol (PEG), and
• a content of the first polymer material in the first solution is 5-30 wt %, and
• a weight ratio of the first polymer material to the drug is 1:0.01-0.3, and
• wherein a solute of the second solution comprises a second polymer material, and the second polymer material comprises at least one selected from the group consisting of:
• polylactic acid and polyethylene glycol, and
• a content of the second polymer material in the second solution is 5-30 wt %.