•   Euphoria^*
•   Sociability - one of GHB's most intriguing properties. Human contact, both physical and mental, becomes more appealing. Rat-contact is similarly enhanced [86].
•   Lightheadedness
•   Inebriation^* and disinhibition, equivalent to a few alcoholic drinks
•   Ataxia^*
•   Aphrodisia - Aside from general disinhibition and sensitization, GHB has been reported to increase erectile capacity and both time required for and quality of orgasm in both sexes [94].

•   Intensification of low-dose effects
•   Sleep - The property of GHB that caused perhaps the greatest initial stir in the medical community is its ability to induce sleep that is undistinguishable, subjectively and objectively, from the normal variety. This sleep may be of normal duration, or you may awaken to full alertness after a few hours [4].

•   Coma - Or something that meets physical criteria for coma^*. One might dispute this name on the basis that the truly comatose don't tend to awaken unharmed in 2-4 hours [52][56][37].
    It is important to understand that the above sources are actual studies of patients who have "overdosed;" many of them come from sources that are actively hostile to the dissemination of GHB. It is equally important to know that the are cases in which GHB has been highly dangerous: this occurs when it is mixed with alcohol, something I cannot warn against strongly or often enough.

•   Tracheal intubation^*, high hospital bills, and psychological evaluation: Effects confined to people who take sleep-inducing doses without telling anyone what they're doing, as this harmless state looks unfortunately similar to lethal opiate^* overdose.

•   Those to be expected from mild impairment of one's faculties of concentration.
•   Inability to drive / operate heavy machinery
•   Tonic-myoclionic seizures - that is, slight trembling and loss of muscle control. Harmless but unpleasant. This effect is highly variable among users, and poses an excellent reason to start with very small doses and slowly work up.
•   Nausea - especially on an empty stomach. This is only a serious problem when combined with sleep. Make sure that whoever is watching you knows to turn you on your side or stomach.

•   Grogginess if awakened
•   Cheynes-Stokes^* respiration - While frequently a cause of concern among medics, in this case it is apparently harmless.
•   More serious loss of coordination
•  Sleep paralysis - this seems to occur only in narcoleptics^* [4] and in any case, resolves spontaneously and safely.

•   Reduced or depressed breathing - while balanced by a reduction in energy use and a deepening of each breath[45], this may not be safe for everyone. Doses at this level are not recommended, nor are they particularly interesting.
•   Incontinence - There are some reports of people urinating or defecating uncontrollably on GHB. For some reason, this was at one time reported as a very common effect. In fact, it seems quite rare and confined only to those who have taken a dose far past that necessary to knock them out (see above). The one reader who experienced this while conscious had just crashed from a 3-day methamphetamine^* binge and was debilitated in plenty of other ways, too.

•   Hallucinations - The media like to report every new drug as a hallucinogen, no matter how wildly inappropriate. One wonders what they're smoking.
•   Amnesia: Perhaps due to confusion with Rohypnol.^®
•   Heart Failure: There was one - one - case to support this belief. We now know that GHB did not kill Hillory Farias.
•   Death: The lowest estimated LD50^* for GHB I have seen is 1100mg/kg^* [33], although I believe this to be incorrect as Mamelak reports monkeys to have received 1000mg/kg without apparent harm [45] . In an average human, 1100mg/kg would be over 66g^* GHB, or 22 active doses, taken all at once! If you don't mix alcohol and GHB, this just don't happen, folks.