How can a solution be prepared using 0.2 g copper sulfate, 0.2 g zinc sulfate, 2 g boric acid, and 2 g borate, with water added to reach a total volume of 200 ml?

What is the cause of elongated crystals forming in a 0.025% tretinoin solution that was initially completely dissolved, given the formula consists of 0.025 g tretinoin, 0.2 g vitamin C, 10 g propylene glycol, 44.89 g purified water, and 44.885 g ethanol 96% for a total of 100 grams?

Is it permissible to use Adeps Solidus (Novata B) with boric acid powder to make ovules, or should a different base be used for this purpose?

Why does a mouthwash composition containing 5g sodium biborate, 2g amylocaine HCl, 10g glycerin, and peppermint water up to 100ml result in turbidity and the formation of a floating oil drop after mixing the separately dissolved solids?

How can a 100 g timolol 0.1% gel be prepared for the treatment of a non-HIV-related Kaposi sarcoma, can it be formulated using eye drops, what is its stability, and are there any alternative suggestions?

What is the cause of a mixture of gabapentin (6%) and lidocaine (0.25%) becoming very liquid when rubbed together on a dynamic ointment slab before being incorporated into buffered cetomacrogol cream (up to 100 g), and how can this be avoided?

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