space motion sickness (SMS)
A condition similar to ordinary travel sickness, produced by confusion of the human vestibular (balance) system and the absence of a gravitational vertical; it is also known as microgravity nausea. About one-third of Apollo crewmembers reported some level of SMS, rising to 60% on the longer-duration Skylab missions. During Space Shuttle flights the incidence of SMS in first-time astronauts has also been about 60%. Treatment with such medications as intramuscular promethazine (Phenergan) has been effective, and the nausea tends to wear off two to three days into the flight.
Related category SPACE AND AEROSPACE MEDICINE
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