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Myth

"If it feels good, I can redose after an hour."

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Content is undergoing medical and legal review. Changes possible.

What's behind it

In the comedown, redosing feels like the logical answer — the effect fades, and a second dose brings it back. Pharmacokinetically, that's often wrong.

What's actually true

  • With MDMA, cocaine, and cathinones, the substance accumulates in the body — the second dose hits a metabolism that's still under load.
  • Tolerance builds up subjectively faster than plasma levels drop — redosing increases risk without a matching gain in effect.
  • With MDMA, the second dose is statistically associated with a higher incidence of hyperthermia, hyponatremia, and serotonin syndrome.

What follows

With substances that have cumulative toxicity (MDMA, cocaine, cathinones, GHB), don't redose. If you do at all, then at most half the initial dose and with a long gap.

The concept of “redosing” has become an across-the-board rule of thumb, without the pharmacokinetic consequences ever being communicated. Specifically:

  • MDMA: Half-life 6–9 h. A second dose after 1 hour means both plasma levels add up. The risk of hyperthermia and hyponatremia rises significantly.
  • Cocaine: Half-life 1 h, rapid tolerance, strong temptation to binge. Cardiac risks accumulate.
  • GHB: Half-life 30 min, an extremely narrow window; redosing without a clear pause is one of the most common causes of emergencies.
  • Cathinones (3-MMC, 4-MMC): short half-life, binge pattern typical, cardiac and psychological complications.

Classic harm-reduction advice: one dose per session, a clear pause until the next session (at least weeks). If you do redose: smaller dose, long gap, awareness of your own physical reaction.

Sources

  • EUDA-Reviews zu MDMA-Toxizität
  • TripSit Redosing Guide
  • Drugcom Faktencheck MDMA