A medical IV bag with a label showing a droplet of liquid. 

IV Bag With Droplet Label

A droplet of liquid falling from a tilted glass test tube.

Liquid Drop From Tube

A side-facing syringe with a meter and liquid.

A speech bubble containing a needle and syringe with a droplet of liquid. 

A needle and syringe with a droplet of liquid.

A syringe with a pointy needle, liquid inside, and droplet by the side.