as tolerated; Use under prescribed night preparation

[luvia]

Apply a small amount of gel as tolerated after Nimue Cleansing Gel and Conditioner. Massage into the skin. Do not use on irritated skin. A mild transient tingling sensation may occur. It is recommended that this product be used every second night only. Usage may be increased depending on acceptance by the skin. (avoid contact with the eyes). Use under prescribed night preparation.

[blizhenskaya]

Мое предположение:
as tolerated - количество геля, которое нормально переносится
Use under prescribed night preparation - используйте вместе с предписанной вечерней подготовкой.