I have strong opinions on what works and what doesnt on sea sickness remedies and wholeheartedly recommend Sturgeron. It is as one of the many items I keep on board for my crew members who may succumb to mal de mar. Sturgeron is actually cinnarizine in 15 mg doses and is prepared in tablet form. Originally developed by Johnson & Johnson it is now available through Janssen-Cilag Ltd in the UK. You can find it available in any current or former British territory. I pick up a fresh supply each time I go to Bermuda or the BVI. Current cost is about $19 USD per hundred.
That said, I also keep plenty of ginger snaps, ginger ale and candied ginger root on board. Lastly and also my last line of defense is Scopolamine, both as patches and also in 1mg topical suringes which I have prepared by any good compounding pharmacy here in the US.
Fair winds, Captain Bruce