What is the best way to prepare an azelaic acid-based gel, and should it be made with a carbomer gel or is another gel base preferred?

Why does the following composition result in an unstable emulsion: 2% metronidazole, 8% lanette wax SX, 8% sesame oil, and aqua up to 100%, for a total of 30 g?

What is the best way to prepare a tetracycline 1% and lidocaine 0.5% mouthwash now that disodium hydrogen phosphate is out of stock, should lidocaine base or HCl be used, can xanthan gum excipient be used to create a suspension, and if sodium citrate is used to achieve the desired pH, how much should be added for these specific percentages?

Is it necessary to fill folic acid into opaque capsules, to what extent does photolysis affect the folic acid content in a magistral preparation, is this effect negligible within the two-month shelf life, and does this photolysis already occur if patients set out their medication for one week outside of the original packaging?

What is the preparation method for a prescription of Ursochol 30 mg/ml (100 ml), given the mother's description of a previously received hospital preparation as a thick white slurry that requires thorough shaking?

Is the stability of atropine eye drops ensured after freezing, and can they be stored in the freezer when prepared as a magistral formula containing 10 mg atropine sulfate, 170 mg boric acid, 1 mg benzalkonium chloride, and double-distilled water?

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