What's the plural form of amitryptiline? Here's the word you're looking for.
Answer
The noun amitryptiline can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be amitryptiline.
However, in more specific contexts, the plural form can also be amitryptilines e.g. in reference to various types of amitryptilines
or a collection of amitryptilines.