1 doctor weighed in:

How long for Meclizine to start working if taken on an empty stomach AFTER motion sickness (severe nausea no vomiting) already started ?

1 doctor weighed in
Dr. Ann Testarmata
Emergency Medicine

In brief: Within an hour

Meclizine works within the hour for most patients I treat in the ED.
Some a little longer, some a little shorter. IF this is the cause of your motion sickness. There are many causes of vomiting in young adults and unless you in a car or on a roller coaster, motion sickness is probably not the diagnosis. Call your doctor and make an appointment.

In brief: Within an hour

Meclizine works within the hour for most patients I treat in the ED.
Some a little longer, some a little shorter. IF this is the cause of your motion sickness. There are many causes of vomiting in young adults and unless you in a car or on a roller coaster, motion sickness is probably not the diagnosis. Call your doctor and make an appointment.
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