Afrin No Drip Original Pump Mist is formulated as a non-Newtonian, or thixotropic, fluid. It exhibits lower apparent viscosity when subjected to shear forces, but a high apparent viscosity when at rest. As a result, it can be readily delivered through a pump spray device immediately after application of a shearing force (such as may be caused by vigorously shaking the product container).
However, the sprayed material rapidly recovers viscosity following withdrawal of the shearing force and remains at least temporarily immobile once on the mucosal surface. This not only allows for optimal delivery of the active ingredient but avoids a problem that commonly occurs with conventional fluids, i.e. dripping off the nasal mucosa into the back of the throat.
Nasal spray, decongestant