Is it possible to prepare Hypergel myself now that it is no longer available?

How can an analog of the English formula consisting of pyridostigmine bromide BP Mestinon tablets 5 mg, keltrol 1% 2.5 ml, and purified water to 5 ml be prepared?

How can simethicone drops for a child be prepared, specifically to match a product from Kosovo where 25 drops contain 40 mg of simethicone, and given that only a simethicone emulsion is available here, what are the potential side effects and risks of long-term use for children at this dosage?

What is the cause and solution for the occasional formation of a slimy layer on top of a compounded syrup containing 75 ml Ventolin syrup, 150 mg pholcodine, 3 ml ethanol, 300 mg pseudoephedrine, 1 g ascorbic acid, and simple syrup up to 200 ml, given the preparation method involves dissolving pholcodine and pseudoephedrine in ethanol, adding a portion of simple syrup, and then adding a solution of ascorbic acid in water followed by the Ventolin syrup and the remaining simple syrup?

Given that a prescription specifies the processing of Endoxan 50mg into 80mg cyclophosphamide capsules and considering the highly mutagenic, carcinogenic, and teratogenic nature of the substance, can such a preparation be made outside of a hospital pharmacy, what safety standards should be observed, and why has the prescriber never received questions regarding this from community pharmacists before?

Is there a standard formula for alum eye drops at a concentration of 1 mg/ml, can benzalkonium chloride be used as a preservative for this preparation, and should a buffer or NaCl be added to ensure the drops are isotonic?

Which viscosity-increasing agent can be used to prepare an L-carnitine solution for a two-year-old MS patient to ensure no interactions occur, given that the current hospital-prepared version is dissolved in water but a higher viscosity is requested?