There is no strobe on this site, ever. Nothing flashes more than once a second.
Reservoir
100%50%empty
100%
a metaphor, not a measurement
↓
The atlas presents
SecondSummer
one night & the weeks after
Body
37.0 °C → a hot room
Water
sip, don't flood
Reservoir
100% → low → refilled
Not an invitation. An atlas of what is known about MDMA, every claim tagged by how sure we are: ◆ solid◈ studied◇ early✺ anecdotal∿ speculative. No smileys were harmed.
Nº 0001 · 20·10·26
Second Summer Atlas · 3,4-methylenedioxymethamphetamine · compiled 20 Oct 2026
MDMA, one night and the weeks after
A few hours of warmth and closeness, paid for in heat, water, a tired heart and a low few days, and lately with pills that often hold two common doses in one. This atlas follows one night and the weeks after it, and tags every claim with how much we actually know: measured in a lab, reported by people who were there, or only rumoured.
Common reported dose
75–125 mg community tables, not advice; one pill now often holds 150–200 mg or more
Starts
30–60 min a slow start is a reason to wait, not to take more
Lasts
3–6 h a low mood can follow for ~3 days
Never with
MAOIs · ritonavir deaths have been reported
scroll into the night
Nº 00 · before the doors open
Doors · How to read this
How to read this
What is known about MDMA comes in very different grades. A blood level measured in a Basel lab and a sentence about the music sounding better do not deserve the same font. Every claim carries two tags: how strong the evidence is, and whether it comes from people describing their own experience. Press a tile to switch that kind of claim off across the whole page.
measuredrememberedrumoured
Scroll is the nightThe clock maps your position onto one night out: the drive in, the rush about an hour after swallowing, the plateau in a hot room, the urge for another, sunrise, then the low days and the weeks it takes to feel like yourself again. The room behind the page lives through the same night.
The reservoirThe gauge at the edge is a metaphor. MDMA makes the brain release much of its stored serotonin at once; the stores are thought to refill in a day or two, the low mood can last several days, and tolerance takes weeks to fade. The gauge stands for all of that together, not for a measurement of anyone's brain.
A glance is enoughThe page starts with what a first-time reader needs. Look closer for detail, or show everything. Press UV and only what keeps people safe stays lit. Search (⌘K or /) always reaches all of it.
Not adviceThis is a reference and an artwork. It is not medical or legal advice. Dose ranges are what sources report, not recommendations.
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↑↓ move · ↵ open · esc close
If it goes wrong
Emergency number in the EU and many other countries:
USA and Canada 911 · UK 999 or 112 · Australia 000 · at a festival, the medics or welfare tent. Call for someone who is very hot, confused, not sweating, fitting, has chest pain, has a bad headache with vomiting after drinking a lot of water, or can't be woken. Tell them what was taken, how much and when: medics are there to treat, and the more they know, the faster they can.
38.4 °C
Sit down. Keep still. Let the room cool you.
MDMA, mixed with…
Many of the worst MDMA nights involve something else as well: another drug, a prescription, a lot of alcohol. Pick what else might be in the night; every rating says why, what trouble looks like and where it comes from.
Background B
Second Summer Atlas
Before the doors open
Hi. This site follows MDMA through one night and the weeks after: an art piece and an education project, made by one person in Czechia. It's here for harm reduction and curiosity, not to talk anyone into anything, and MDMA is illegal almost everywhere. Every claim is sourced and tagged by how strong the evidence is, because sources can be wrong or out of date, and so can I. Nothing here is medical or legal advice. If someone is very hot, confused or can't be woken, call 112 (EU), 911 (US) or 999 (UK). No ads, no tracking, no accounts: one small note in your browser remembers you've read this.
About Second Summer Atlas
Second Summer Atlas is a personal art and education project about MDMA, made by one person in Czechia. It belongs to a small family of atlases (Hyperspace Atlas, K-Hole Atlas, Bicycle Day Atlas, Second Summer Atlas). Nobody pays for it, nothing is for sale, and it is not affiliated with any organisation.
Why it exists
People use psychoactive substances whether or not anyone approves. Accurate, honest information reduces harm; myths and silence increase it. This site is written for adults, in that spirit: harm reduction and education, not promotion. Not discouraging use is different from encouraging it, and nothing here encourages it.
How to read it
Every claim links to its source and carries a trust tag showing how strong the evidence is, from replicated research down to anecdote. Please take the tags seriously: some sources are weak, some are old, and some will turn out to be wrong. I make mistakes too. If you spot one, tell me at contact@mdma.page.
How the tags work
◆ Solid
replicated research, regulatory fact, or settled history and law
◈ Studied
controlled human studies or official statistics, but few, small or short
◇ Early
animal, cell, pilot or single studies, case reports, company announcements
✺ Anecdotal
user reports and community consensus
∿ Speculative
hypothesis, folklore, or a claim the evidence does not support
❝ Self-reported
comes from people describing their own experience; combines with any tag
When unsure, a claim gets the lower tag. Every card lists what it rests on; nothing is tagged on reputation alone.
What it is not
This is not medical, psychological or legal advice, and it is no substitute for a doctor, pharmacist or lawyer. MDMA is a controlled substance in almost every country, including under the UN's 1971 Convention, and laws differ widely; checking and obeying the law where you are is your responsibility. Nothing here is an instruction to obtain, make or use any substance. To the extent the law allows, I am not liable for how this information is used.
In an emergency
Call 112 (EU, and from most mobile phones worldwide), 911 (US and Canada) or 999 (UK). Tell responders what was taken: they are there to help. Stay with the person.
Credits & licences
This atlas stands on other people's careful work. Drug-combination ratings start from the combination data of TripSit, credited and used non-commercially; where the atlas rates something differently, the card says so. Some dose and duration tables are adapted from PsychonautWiki, reformatted and combined with other sources; those adapted tables are shared under the same licence, CC BY-SA 4.0. Reagent colours follow Wikipedia's reagent-testing charts (CC BY-SA 4.0). Erowid's vaults are linked, never copied. Drug-checking figures come from the services named on each card (among them Saferparty Zurich, DIMS / Trimbos, checkit!, Energy Control, The Loop, WEDINOS and the EUDA). The recovery-position drawing is by Mrmw on Wikimedia Commons (CC0). Typefaces come from Google Fonts under the SIL Open Font License.
If you run one of these projects and would like something credited differently, changed or removed, write to contact@mdma.page and it will be.
Privacy
No ads, no analytics, no tracking, no accounts. Your display preferences, and the fact that you have seen the welcome card, are kept in your browser's local storage and never leave your device.