Here you have an animation. It's based on the hand cursor, the one used to pick up items and to open doors. (That's how I have tested it in-game.)
However, the images are in a different order and in a different direction, and there is also a different movement. Apart from that I added a small green cross to explicitly refer to an addition "+", as the animation is not used to take objects, but to add/apply objects to somebody. The green is in contrast to the red healing cross as this animation can be used for all kinds of drugs, supplements, poison, etc.

http://www.filefactory.com/file/8z9irprj4e5/n/APPLY_zip

EDIT: As it is the case for several animations, I suggest to use the red colorful variant for the action and the colorless for non-action (cf. the other hand cursor, the fist, etc.).