science

SDA (drug)

SDA (drug) is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand SDA (drug) rather than just read about it. In short: SDA, also known as 3,4-methylenethiooxyamphetamine (3T-MDA), is a putative entactogen and psychedelic drug of the phenethylamine and amphetamine families related to 3,4-methylenedioxyamphetamine (MDA). It is the analogue of MDA in which the oxygen atom at the 3 position within the 3,4-methylenedioxy substitution has been replaced with a sulfur atom to give a 1,3-benzoxathiole rather than 1,3-benzodioxole ring system.

Key takeaways

SDA (drug) belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect SDA (drug) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of SDA (drug) from memory before moving on to harder problems.

Reference excerpt

SDA, also known as 3,4-methylenethiooxyamphetamine (3T-MDA), is a putative entactogen and psychedelic drug of the phenethylamine and amphetamine families related to 3,4-methylenedioxyamphetamine (MDA). It is the analogue of MDA in which the oxygen atom at the 3 position within the 3,4-methylenedioxy substitution has been replaced with a sulfur atom to give a 1,3-benzoxathiole rather than 1,3-benzodioxole ring system. The drug is also the N-desmethyl analogue of 3,4-methylenethiooxy-N-methylamphetamine (SDMA; 3T-MDMA).

Interactions

Pharmacology

Pharmacodynamics Similarly to MDA, SDA is a serotonin–norepinephrine–dopamine releasing agent (SNDRA) and a non-selective serotonin 5-HT2 receptor agonist. However, SDA was 16-fold more potent as a serotonin releaser, 16-fold more potent as a dopamine releaser, and 2-fold more potent as a norepinephrine releaser than MDA in HEK293 cells in vitro. In addition, it was 2- to 3-fold more potent as an agonist of the serotonin 5-HT2A, 5-HT2B, and 5-HT2C receptors than MDA. SDA had largely similar activational efficacies at the serotonin 5-HT2 receptors as MDA. Due to its greater potency as a monoamine releasing agent, SDA may be active at lower doses or concentrations than MDA. SDA produced hyperlocomotion and hyperthermia in rodents and to a greater extent than SDMA or MDMA. However, SDA did not produce significant rewarding effects in the conditioned place preference (CPP) paradigm unlike MDMA but similarly to SDMA. Hence, SDA might have reduced misuse potential compared to other related drugs like MDMA. Similarly to findings with MDA, SDA produced the head-twitch response, a behavioral proxy of psychedelic effects, in rodents, and hence may produce hallucinogenic effects in humans. Unlike SDMA and MDMA, SDA produced thigmotaxis in the open field test, an anxiety-like effect. SDA may be cardiotoxic due to serotonin 5-HT2B receptor agonism.

Pharmacokinetics The metabolism and metabolites of SDA have been studied. It showed more rapid clearance than MDA in rodents and hence may have a shorter elimination half-life and/or duration.

Chemistry

Synthesis The chemical synthesis of SDA has been described.

Analogues A notable analogue of SDA is 4T-MMDA-2 (2-methoxy-4T-MDA), which was described by Alexander Shulgin in his book PiHKAL (Phenethylamines I Have Known and Loved). Other analogues of SDA include SDMA, MDA, MDMA, 5-APB, 5-APDB, and 6-APBT, among others.

History SDA was first mentioned in the scientific literature by 2013, but was only conceptually described at this time. Subsequently, its synthesis and preclinical pharmacology were described by Nina Kastner and colleagues including Matthias Grill at MiHKAL in 2025. Prodrugs of SDA and/or related compounds have also been described.

See also Substituted methylenedioxyphenethylamine § Related compounds List of investigational hallucinogens and entactogens

References

External links SDA - Isomer Design

Illustrations

Worked examples

Example 1 — a first encounter with SDA (drug)

Start with the simplest possible case. Write down what SDA (drug) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to SDA (drug) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about SDA (drug) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of SDA (drug)

In research: SDA (drug) appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses SDA (drug) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: SDA (drug) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 5-HT2A agonists, 5-HT2B agonists, 5-HT2C agonists, so understanding it makes those chapters shorter.
In everyday life: Look for SDA (drug) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study SDA (drug) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what SDA (drug) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain SDA (drug) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is SDA (drug) in simple terms?

Why does SDA (drug) matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study SDA (drug)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on SDA (drug).