I use transdermal scoplamine patches. But I only get a bit seasick on boats. It works pretty well for that, but might not be the answer for you. It does require a prescription and wasn't covered by my insurance, but it wasn't crazy expensive.
The manufacture of Scopace was suspended around 2012. I have not heard that it is back in production, but a compounding pharmacy can make the equivalent for you with a prescription. It's more expensive than the orginal Scopace, but cheaper than the patch.
Transderm Scop (the patch) Scopace, and Kwells are all the same medication. The dosage of one Kwells tablet is lower than one Scopace tablet. I have used the patch and I found that the first day the side effects are intolerable, and by the third day the effectiveness is inadequate. Only on day 2 is it functional and acceptable. (Side effects for me are dry/sore throat and dizziness. Other side effects are possible.) So I switched from the patch to the Scopace tablet.
When they quit making Scopace I began buying Kwells over the internet from Australia. They can legally sell you (if I remember correctly) six boxes of 12 tablets each by mail without a prescription. I may be off on the numbers. The tablet can be split, for a lower dose, or doubled, for a larger dose. I find that for me (140-pound man) one Kwells is the ideal dose. If conditions are very rough, nothing will help, but if conditions are moderate, with one Kwells I won't be sick enough to spoil the fun. (I get very seasick, very easily. I get sick on porch swings and rocking chairs.)
I used to use meclazine, which helped, but is less effective for me than Kwells. Meclazine lasts 12 hours. Kwells lasts 6 or 8 hours. I like the shorter duration for day outings because I don't need it once I'm off the boat. On a live-aboard, obviously a longer duration is an advantage, but I need the most powerful stuff I can get. Ginger and wrist bands do absolutely nothing for me. (Though I do like the taste of ginger beer.)
If there is a big swell, I will get extremely sick on the surface. For this reason, I ask permission from the DM to go in early and immediately descend to 15 feet, where I'll wait for my buddy or the group.