Skip the counter medicine and do this.

Do not make large right or left movements with your head. Don't bend down and get up quick. Do not move your head in a side to side motion quickly.

When looking out the window fix on a point on the distant horizon. Don't focus on the ground moving below. Do the drugs if you must but the above things are significant contributors to the motion sickness and your inner ear triggers it. Also take early morning flights for some reason this works to lessen the anxiety of flying.