Could you provide the composition of a syrup containing isoniazid, and can you also specify if it has a long shelf life?

How can I prepare the following eye drops: 100 mg of nystatin, 90 mg of sodium chloride, and 1 mg of chlorhexidine acetate, with water up to 10 ml?

How can econazole nitrate be successfully incorporated into a Carbopol gel, given that it is insoluble in water and only slightly soluble in organic solvents, resulting in visible small particles?

What is the cause of the persistent precipitation, presumably of sorbic acid, when preparing the antitussive and decongestant syrup according to the instructions on the Dynaphar website?

Which excipients are best used to prepare a sulfur lotion?

How can precipitation be prevented in a preparation containing 2 g prednisolone, 2 g chlorhexidine gluconate, 4 g castor oil, and 50 degree ethanol up to 200 ml, given that dissolving the prednisolone in 90 degree ethanol and mixing it with chlorhexidine and castor oil before gradually adding water resulted in a white precipitate?

Do you know of a good formula for ranitidine syrup (10 mg/ml) that is stable and has an acceptable taste?