What is the best base to use for a 50% DMSO cream prescribed by a hospital to be applied to hand joints, specifically considering the desired consistency given the high liquid content?

What lotion or milk can be used to prepare a 30% DEET-based anti-mosquito milk for a horse to prevent summer eczema, given that DEET is immiscible with water, only miscible with isopropyl alcohol, has unclear solubility in the fat phase, and the desired base is an emulsion?

Are there any problems with the preparation of this HPMC gel consisting of 4% hydroxypropyl methylcellulose, 20% propylene glycol, and water up to 100 g?

What is the cause and solution for a preparation containing 40g urea, 35g vaseline, and 15g buffered cetomacrogol cream that became rock-hard and grainy after a few hours in an aluminum tube, given that the physician intended a 40% urea ointment for nail softening and added the cetomacrogol cream to improve the spreadability of the standard 40% urea in vaseline formula?

What is the best way to prepare 200 ml of a formulation containing 0.1% triamcinolone acetonide, 2% salicylic acid, 2.5% peanut oil, 2.5% lanette wax SX, 5% tween 60, and water up to 100%, with the instructions to apply it to the scalp in the evening and wash it out in the morning?

What can best be added to provide a minimum level of stability to the following suspension lotion for external use containing 7 g precipitated sulfur, 5 g salicylic acid, 5 g resorcinol, 20 g alcohol 94°, and water up to 100 ml, and is it advisable to add 1% HPC 400 and double the amount of alcohol to keep the soluble products in solution, or should the antiseptic alcohol be retained or replaced by isopropyl alcohol?

How can a stearate cream with problems be prepared using 17 g of stearic acid, 11 g of water, 69 g of glycerol, and 3 g of Sol ammoniae BP5?