How should I prepare the following ointment: hydrocortisone acetate 3.75 mg/g, lidocaine HCl 75 mg/g, aluminum subacetate 25 mg/g, zinc oxide 180 mg/g, and unguentum simplex up to 30 g?

Could you provide me with a formulation for the treatment of anal fissures or cracks?

Which cream base should be used for Ketamine 3% and Amitriptyline 3%, given that PLO gel is recommended for the individual components, and what is the composition and preparation method; furthermore, is the Pentravan cream suggested by Fagron a better alternative?

Can phenytoin 10% cream be prepared using buffered cetomacrogol cream TMF, specifically for a prescription of 10% phenytoin in a base cream up to 60g, as an alternative to the solution previously suggested in the Q&A box (consisting of 25mg nipagine, 15mg nipasol, 1g sodium lauryl sulfate, 12g propylene glycol, 25g cetyl alcohol, 25g vaseline, and water up to 100g) to achieve a well-spreadable cream, and can phenytoin sodium be used for this preparation?

How can I prepare retinoic acid 50 mg in non-ionic emulsion base MFS up to 50 g, and what is its shelf life?

How can I prepare hydroquinone 4% in unguentum emulsificans BP-MFS, and what is its shelf life?

What are the stability problems of a solution containing 3 grams of Phenobarbital sodium and purified water up to 300 cc?