MIonxidil is an anti-hypertensive and can lower blood pressure in some individuals which in turn causes dizziness. Provided one stops the medication promptly and does not resume use, dizziness should disappear if the cause was in fact due to minoxidil. There are many causes of dizziness, so be sure to have a full examination if the dizziness does not go away upon stopping minoxidil.
Minoxidl, once you stop it, the side effects go away. Dizziness is one of the know side effects and you should stop its use