Why does a solution containing 4 g erythromycin, 1 g zinc acetate, 10 g propylene glycol, 45 ml 65° ethanol, and water up to 100 ml result in a cloudy, thick liquid when erythromycin dissolved in ethanol is mixed with zinc acetate dissolved in water, propylene glycol, and ammonium acetate, is this reaction normal, and is the clear liquid obtained when following the TMF method with isopropanol a better alternative?

What is the recommended alternative gel basis for a 3% flufenamic acid and 3% lidocaine formulation, and can lidocaine base be used instead of lidocaine HCl in that new basis, given that the current carbopol gel becomes completely liquid and unusable after a few days despite having already switched to lidocaine HCl to address initial incompatibility?

Are there better alternatives to phthalates for coating capsules, given the large amount of negative information being spread about them?

Which suppository base is suitable for a prescription containing both indomethacin and paracetamol, given that the indomethacin specialty (Dolcidium) uses saturated polyglycolic glycerides and the paracetamol specialty (Perdolan) uses semi-synthetic glycerides?

How can a mouthwash containing 1.2 ml of chlorhexidine digluconate 20%, 100 g of sorbitol syrup 70%, 1 g of banana aroma, and water up to 200 ml be given a better taste for a 10-year-old cancer patient, given that the flavor was unsatisfactory without the aroma, and is banana aroma a suitable choice in combination with chlorhexidine; furthermore, is a 200 ml volume too large to dispense at once considering the sorbitol content and the risk of fungal growth in the mouthwash?

How can macrogol suppositories be prepared according to a prescription for 30 units so that they do not crack?

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