What are the causes of precipitation in Mouthwash I, containing 5 g sodium bicarbonate, 10 g propylene glycol, 2 g Tween, 2 g amylocaine, 5 g myrrh tincture, 5 g opium tincture, and mint water up to 100 ml, and how can this be addressed alongside the preparation of Mouthwash II, which consists of 3 g sodium bicarbonate, 5 g borax, 10 g glycerin, 2 g amylocaine, 10 g myrrh tincture, 10 g opium tincture, and mint water up to 100 ml?

Is it true that a 1% isosorbide dinitrate cream for the treatment of anal fissures must not be dispensed in an aluminum tube due to a potential reaction, but should instead be stored in a jar, requiring the patient to apply it using finger cots rather than a cannula?

Why does a cream containing 0.5 g prednisolone, 2.4 g erythromycin, and cold cream up to 100 g (composed of 8 g white wax, 10 g cetaceum, 52 g peanut oil, 5 g Arlacel C83, 20 g aqua conservans, 5 g castor oil, and 0.2 g sorbic acid) break, is there an incompatibility between erythromycin and Arlacel, and why was the preparation successful when made using unbuffered cetomacrogol cream NF6 instead?

Is it possible to prepare Litican (alizapride) suppositories using crushed tablets for a patient with severe migraine who currently requires injections, given that alizapride is unavailable as a raw material, and what is known regarding rectal absorption and necessary dosage adjustments?

What is the correct preparation method for 100 g of water paste with menthol NF VI, containing 1 g levomenthol, 25 g zinc oxide, 25 g talc, 25 g glycerol, and purified water q.s. ad 100 g, specifically regarding whether the levomenthol should be moistened with disinfectant alcohol before being added to the powders, followed by adding glycerol and then water bit by bit to form a paste?

Are metronidazole suppositories for children prepared in a special way, and should something be added for stability?

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