How long does prochlorperazine take to work for dissness?

Oral or IV or IM: If you are taking it for vertigo and IF it is going to work should take effect in 20-30 minutes orally or by dissolving tablet in your mouth but a bit quicker for IV and variable for IM. 2 issues; do you rally have vertigo or is it another problem? Even if you have true vertigo it may not work. If not improving see your doctor.