Your designated doctor will try to accommodate the formula that is requested. However, the final prescription decision is dependent on your history, which can prompt them to choose another treatment plan better suited for you. The decision may be due to a stated allergy to a particular ingredient that may result in a cross-sensitivity, or because the medicine you requested may be too strong to start with if you haven't used these active ingredients previously!
Please note that the primary objective is to help you improve your skin. At times, it's better to go slow and steady rather than start off very aggressively to avoid any potential irritation. Typically, it is recommended to use the treatment for 6-8 weeks before requesting a change to the formula. Requesting a particular ingredient or medication will not guarantee you receive that formula, as the final decision is up to your Board-Certified Dermatologist.