What is the preparation method for a 1% epinephrine eye drop starting from epinephrine bitartrate, and which buffers should be used?

Regarding the shelf life of Glycopyrronium oral solution FNA, since the formula for glycopyrronium bromide oral solution FNA does not specify a shelf life and the general table suggests a 1-year period for an FNA solution containing preservatives, is this 1-year duration correct according to the FNA, given that I only have access to an old version from 2009?

How should one proceed with the preparation of enteric-coated (E.C.) capsules containing 10 mg methoxsalen, 30 mg Alucol, and 30 mg magnesium trisilicate, specifically regarding the light sensitivity of methoxsalen during preparation and whether the tablets should be pulverized or the bulk product used?

What is the best preparation method for the following formula: 20% azelaic acid in 50g of non-ionic hydrophilic cream?

Which aids should be used to create a good suspension of the following formula: 6g salicylic acid, 3g metronidazole, 0.03g dexamethasone, 30g propylene glycol, and water up to 300 ml?

Do you have the formula for Lotio Kummerfeldi for me anywhere, given that the lotion contains hexachlorophene, resorcinol, and sulfur, among other ingredients?

How should a gel containing 3.5% tetracaine and 2.3% lidocaine be prepared, specifically regarding whether to use the base or HCl forms, how to address incompatibility with carbopol gel, and whether an HPMC gel should be used?