I know of anecdotal evidence for the following drug-related side-effects:

  • It can happen while getting used to a new drug, or when quitting a drug. Probably also some other situations.
  • The feeling lasts a split second.
  • All hearing disappears when it happens.
  • Before and after the hearing disappears, there is some sort of auditory noise that lasts about equally long.
  • It will feel like some sort of mental disconnection, as if you passed out for just a split second - except you don't lose physical control.
  • It can happen many times every day.
  • All cognitive and physical functions seem to work like normal.
  • It can happen with different medications, including Effexor/Venlafaxin and 5-htp.

What can this temporary black-out be? Does it have a scientific name (i.e., is it a known and recognized phenomenon?)


closed as unclear what you're asking by Chris Rogers, Seanny123, Robin Kramer, Yvette Colomb, mfloren Jul 30 '17 at 19:59

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  • $\begingroup$ I added one of the related medications to the questions. I need to check up on the other one. Also improved the wording for the duration of the effect. $\endgroup$ – Berit Larsen Dec 11 '14 at 23:38
  • $\begingroup$ You might want to look into absence seizures, which have a similar (although not identical, I think) profile. $\endgroup$ – Krysta Dec 12 '14 at 14:00
  • $\begingroup$ Doesn't look very much like it: This phenomenon is much shorter and involves no movement while it happens. $\endgroup$ – Berit Larsen Dec 12 '14 at 16:31
  • $\begingroup$ Absence seizures can also be brief (although usually not split second, so you're right there), but they don't generally involve any movement. $\endgroup$ – Krysta Dec 12 '14 at 18:08