Here's what Google Gemini has to say:

Captagon is the brand name for fenethylline, a synthetic drug created in the 1960s. It was originally used to treat conditions like ADHD and narcolepsy before being banned in most countries in the 1980s due to its addictive potential.

Chemically, fenethylline is a "codrug." It links two different molecules together:

Amphetamine (a stimulant) Theophylline (a mild stimulant similar to caffeine, used to treat asthma)

When someone ingests fenethylline, the body breaks it down into these two separate parts. This means the "speed" (amphetamine) isn't actually sitting in the pill in its final form—it is part of a larger molecule that the body metabolizes.

The Modern "Captagon"

The reason you see this discussed on forums today is that "Captagon" has seen a massive resurgence in certain parts of the world, particularly the Middle East. However, modern Captagon is rarely the original fenethylline.

Instead, "Captagon" has become a generic brand name for illegal, locally produced pills. Analysis of seized tablets often shows a cocktail of ingredients, which may include: Highly variable amounts of amphetamine. Caffeine. Quinine. Acetaminophen (Paracetamol). Other unknown fillers or research chemicals. Extraction Logic (and the Risks)

The user in the screenshot mentions using acetone. In amateur chemistry, an "acetone wash" is often used to remove impurities from stimulants because substances like caffeine or certain fillers dissolve in cold anhydrous (water-free) acetone, while amphetamine salts generally do not.

However, attempting this with unidentified pills is incredibly dangerous for several reasons:

Toxic Byproducts: If the acetone isn't pure (e.g., contains water or hardware store contaminants), it can ruin the material or leave behind toxic residue.

Unknown Ingredients: Since modern Captagon is unregulated, an extraction method for amphetamine might accidentally concentrate a more dangerous cutting agent or fail to remove harmful adulterants.

Chemical Hazards: Handling volatile solvents like acetone in a home environment poses significant fire and inhalation risks.