What formulation for a tretinoin gel is a dermatologist looking for?

Is there a morphine syrup available that has a longer shelf life?

What is the correct formulation for a 5% podophyllin solution prescribed by a gynecologist for treating warts using a tampon application, given that the original formula cannot be found?

As Flamiclens is currently out of stock at the company and a doctor has requested a custom formulation, is it necessary to add a citric acid buffer to a proposed mixture of 5% acetic acid, 0.9% NaCl, 0.01% benzalkonium chloride, and aqua conservans, or do you have an alternative suggestion?

What could be the cause of a cream containing 0.25g prednisolone, 1g erythromycin, 5g zinc undecylenate, 5g salicylic acid, 5g almond oil, and Beeler basis up to 50g breaking twice for a client, considering that there are no apparent incompatibilities but the thermal labels showed discoloration, leading to the suspicion that the cream is being stored at a temperature that is too high?

Given that Zitromax syrup is very bitter, what are the best ways to improve the taste of this syrup?

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