How can the very bitter taste of a syrup based on proguanil (Paludrine 500 mg per 100 ml) be masked as much as possible?

What is the formula for diltiazem suppositories, given that while nifedipine was previously used in ointments and suppositories, diltiazem HCl is now also used for treating fissures; additionally, what would be an appropriate dose for these suppositories, and should there be concerns regarding arrhythmogenic properties since the hepatic first-pass effect is bypassed?

Given that the water-soluble vitamin A solution is unavailable, is it possible to prepare an oral liquid with a concentration of 50,000 I.U. / ml?

Should we use buffered or unbuffered cetomacrogol cream TMF for 1.5 g of tetracycline HCl in cetomacrogol cream TMF?

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

How should erythromycin be incorporated into Roc Dermatologique crème adoucissante, given that the process fails and Roc's suggestion to add glycerin does not sufficiently solve the problem, and are these two substances potentially incompatible, and if so, what are the possible alternatives?

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