What is the cause of crystallization in a preparation containing 4 g minoxidil, 60 mg betamethasone valerate, 20 g propylene glycol, 30 g alcohol 60°, and water up to 200 ml, and what are the required amounts of alcohol or propylene glycol to prevent this, given that the components initially dissolve with heating but recrystallize after several hours?

Is it a standard rule to weigh 5% extra active ingredient when preparing capsules, given that in 2011 two preparations were only marginally compliant at 90.3% of the prescribed dose when 5% extra was added, but this practice has been discontinued leading to concerns about current compliance, especially since 10% extra is still weighed for folic acid?

What is a lotion or gel containing 20% diethyltoluamide?

What solution can be recommended when a dentist requests a preparation of 15g NaEDTA, 0.75g cetrimide, and water up to 100ml, but a precipitate forms after some time that can cause needle blockage?

What is the use of a gel containing 6 g theophylline, 3 g urea, 3 g menthol, 10% denatured alcohol, 6 g caffeine monohydrate, and carbomer gel up to 300 g?

Can a 1% aqueous solution of atropine sulfate, up to 200 ml, for external use be dispensed?

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