Can I prepare Laudanum myself?

Given that Laudanum is no longer available for patients who have undergone a Whipple operation and suffer from chronic diarrhea, is Tinctura Opii Normata a suitable alternative despite its unpleasant taste, and can it be compounded into a more palatable medicine, and if so, with which specific ingredients?

Do you know the pKa of cetirizine?

What is the shelf life of a 4% tetracaine solution that I prepared?

How can the following preparation containing 30% AlCl3, 2% methylcellulose, and aqua up to 300 ml be made, given that the Martindale method of adding 1/3 of the methylcellulose to boiling water and then adding the remaining water as ice while mixing seemed unfeasible, and an attempt with 0.5% NaCMC resulted in a slimy mass that separated completely after mixing with AlCl3?

Is it advisable to prepare a prescription for 100 ml of 0.5% capsaicin in Orabase for use in the mouth twice daily, starting from capsicum oleoresin, given that literature typically suggests a concentration of 0.025% and no references support a 0.5% concentration for this application?

What is the reason why a client is unable to prepare yogurt with a household appliance, even when using a double dose of rennet from a bottle received from Fagron where 1g is capable of curdling 15 kg of milk?