I am fortunate I don't suffer from it. My wife swears by peppermint beadlets and ginger candy. That being said, I don't think I will ever get her to ride the Cozumel ferry ever again.
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Never get on the boat with an empty stomach.
I always eat a sausage & egg mcmuffin the morning of a dive.
Kwells
This is the answer.
LOL. It seems to work for me, I've never been seasick.
Ouch I would feel sick eating that before a dive...
I eat bread with ham and I drink still water, preferably room temperature
I have fairly extensive experience with bad seasickness diving in the Puget Sound, Cancun and Cozumel area including going out with native fishermen there for 8 hour days in a small boat with bad waves, sometimes out of sight of land. I was sick almost every diving day for 16-17 years of visiting there. Throwing up through my reg on safety stops. Laying flat in the bottom of the boat unable to even talk to people then managing to get equipment on, feeling ok below wave action and sick again as we approached the surface. I used Dramamine and meclazine, taking two tablets the night before and more in the morning with limited good results. After I started to use Hyoscine my problems completely disappeared with the exception of some extreme trips with the fishermen when they were seasick too. Even then I stayed functional. I take Meclazine the night before, I want to sleep anyway, and Hyoscine in the morning. You can buy it online from Australia. Costs about $1/pill and would be cheap at 10 times that. Hyoscine is the active ingredient in the Scoplamine patch but with the pills you only have to take it when you need it. I have had no side affects but I am fairly resistant to antihistamines. YMMV.They sell it with this name in the UK, but not in Italy
Anyway it seems the scientific name is Hyoscine
Hyoscine - Wikipedia
Interesting, perhaps they also sell it here with a different commercial name
May I ask why do you consider it better than the alternatives?