Can quinine hydrochloride be used instead of quinine dihydrochloride in a non-ionic cream consisting of 6 g quinine dihydrochloride, 4 g Tween 80, 40 g cetyl alcohol, 10 ml glycerol, 10 ml sweet almond oil, and distilled water up to 200 g, and what is the intended use of this cream, which the patient claims is for use as a sunscreen?

What should be done when Ciloxan and De-icol eye drops crystallize after being stored in the refrigerator for two nights?

Can you provide the formula for a zinc oxide paste containing 5% lidocaine and 50 g of zinc oxide paste?

How can the exact amount of necessary excipient be calculated for making capsules, given that the current method of visually estimating the powder volume in a watch glass or graduated cylinder is often arbitrary and imprecise, and subsequently makes geometric mixing difficult?

Regarding the preparation of a 50 mg/ml pregabalin solution for a cat, is a standard solution stable, or are additions such as stabilizers or pH adjustments required?

What is the shelf life for a preparation containing 2,400,000 IU nystatin, 1.2 g erythromycin, and 0.1 g prednisolone in AVA cream, given that the physician refuses to split the preparation despite a known reaction between nystatin and erythromycin?

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