... Several studies have found it effective against nausea from seasickness and other conditions.

A study in the journal Lancet involved 36 people highly susceptible to motion sickness. The researchers had the subjects take either two capsules of powdered ginger, an anti-nausea medication or a placebo, and then, 20 minutes later, spin on a motorized chair for up to six minutes. Taking ginger delayed the onset of sickness about twice as long as taking the medication. The study also found that half the subjects who took ginger lasted the full six minutes, compared with none of those given the placebo or the medication.

A study by Danish scientists looked at 80 naval cadets prone to seasickness and found that those given one gram of ginger powder suffered less in a four-hour period than those given a placebo. - New York Times® (21 Aug. 2007)

In men and women on a two-day cruise, a 100 mg dose of the powdered herb, 30 minutes before travel and then every four hours, proved as effective as Dramamine® (dimenhydrinate) in relieving queasiness. Ginger was the preferred remedy: It made people far less drowsy than Dramamine®. - WholeHealthMD.com®

Ginger (Zingiber officinale) in its various forms is often used to calm the stomach, and it is now known that the oils it contains (gingerols and shogaols) appear to relax the intestinal tract in addition to mildly depressing the central nervous system.

Some of the most effective forms of ginger include the powdered, encapsulated form; ginger tea prepared from sliced ginger root; or candied pieces. All forms of ginger should be taken on an empty stomach when treating motion sickness. - HealthLine.com®

Some people drink ginger ale or ginger tea or take powdered ginger capsules to try to prevent motion sickness.

Ginger root (Zingiber officinale) has long been regarded in traditional Chinese medicine as a treatment for several conditions, including stomachache and nausea. - WebMD®

Ginger, long recognized as a gastrointestinal calmative, has been shown in controlled studies to be very helpful, even for carsick dogs and children ...

Ginger should be taken as a capsule or coated tablet to avoid esophageal irritation. Various over-the-counter versions of ginger capsules are sold in health food stores and pharmacies ...

The only reported side effect of ginger is an occasional ginger-flavored burp. - New York Times®

Mythbusters (episode 43 of a tv series on the Discovery Channel) -

... They tested various non-pharmaceutical remedies, a placebo, and an over-the-counter pharmaceutical drug and found that ginger pills were a plausible remedy. The pharmaceutical drug worked as well, but made them loopy. - Annotated MythBusters®

Adam is well known to suffer from seasickness. In a test rig meant to induce seasickness, Adam lasts about 3.5 minutes. Jamie, Kari and Tory show no signs of trouble, but Grant also gets sick after 10 minutes. With a baseline and two test subjects, it's time for the tests.

... After taking the pills and waiting an hour for the effects to kick in, Adam goes 25 minutes in the chair with no problem; Grant follows up with 30 minutes nausea free. - TV.com®