Occasionally a certain kind of vertigo, or a “spinning dizziness” (also called Benign paroxysmal positional vertigo) can be triggered by certain yoga poses – especially inversions like Downward dog where your head is lower than your heart:
‘Benign paroxysmal position vertigo (“BPPV“) is a condition of the inner ear where tiny crystals become dislodged and incorrectly stimulate the wrong balance nerves in one ear. This can cause spells of dizziness lasting 30 seconds or so when certain head movements are made.‘
There are positioning treatments that reverse the effects and so no medication should be necessary but we always advise checking with your doctor if you experience this.
Read more about exercise and BPPV and how some activities can trigger it more than others.