Cocaine
Synthesis Route
Coca leaves are macerated with kerosene, sulfuric acid, and lime to extract crude coca paste. The paste is refined into cocaine base (washed with ammonia, dissolved in solvents) and converted to cocaine hydrochloride (HCl) salt — the white powder — for trafficking. Crack is cocaine HCl reverted to freebase using baking soda and water.
Predictable Synthesis Byproducts
Present in essentially 100% of real cocaine — they come from the plant and the process, not from cutting:
- cis- and trans-cinnamoylcocaine — structural isomers from alkaloid extraction. Their ratio is used by forensic labs to identify geographic origin (Casale & Waggoner, 1991).
- Tropacocaine, norcocaine — minor coca-leaf alkaloids; norcocaine is hepatotoxic (Brzezinski et al., 1994).
- Solvent residues — kerosene, gasoline, sulfuric acid traces, ammonia, potassium permanganate. Over 99% of DEA-analyzed samples show heavy oxidation from permanganate processing (DEA, 2024). Solvent residue is worse in poorly refined "brick" cocaine.
Typical Adulterants
There is a large gap between wholesale and street-level data. DEA CY2024 wholesale seizures were 97% uncut at average purity 88% — but this is kilo-level product before street dealers cut it further. European drug-checking data, closer to consumer level, reports median street purity around 45%, often below 30% (Brunt et al., 2017; Solimini et al., 2017). The estimates below reflect street-level reality.
| Adulterant | Est. probability | Why it's added | Risk |
|---|---|---|---|
Levamisoleveterinary deworming agent |
High — ~50–80% | Bulks weight, passes street purity tests, metabolizes to a mild stimulant | Agranulocytosis (~0.08–5% of exposed); vasculitis; skin necrosis; leukoencephalopathy. ~27% recurrence on re-exposure (Larocque & Hoffman, 2012) |
Phenacetinbanned analgesic |
Moderate — ~20–50% | Resembles cocaine, cheap weight | Kidney damage; suspected carcinogen — banned for human use since 1983 |
Caffeine |
Moderate — ~20–40% | Mimics stimulant feel, masks low purity | Cardiac stress |
Local anestheticslidocaine, benzocaine, procaine, tetracaine |
Moderate — ~10–30% | Mimic cocaine's gum-numbing "test" | Cardiac arrhythmias, seizures at high doses |
Diltiazemheart medication |
Low–moderate — ~5–15% | Modulates cocaine's cardiovascular effects | Hypotension, severe arrhythmias |
Hydroxyzinesedative antihistamine |
Low — ~5–10% | Reduces cocaine anxiety | Convulsions, sedation |
Fentanyl |
Low but regionally variable — ~1–15% | Cross-contamination at distribution, not a deliberate cocaine cut | Fatal respiratory depression in opioid-naive users — the lethal worst case even at low probability |
The fentanyl line: a ~1–15% chance is low, but the outcome if it hits an opioid-naive user is death. Low probability, maximum consequence.
Removal & Testing
Cocaine cannot be purified at home. Cutting agents are dissolved into the same crystal matrix. Online "recrystallization" methods produce no real purification and lose drug to dissolution.
- Reagent kits (Marquis, Mecke, Scott) — confirm cocaine presence but not purity. Levamisole and phenacetin produce no strong color change — they are invisible to standard reagent kits.
- Fentanyl test strips — detect fentanyl at low-nanogram levels. In regions with documented cross-contamination, this is the single most useful field test for cocaine (Lambdin et al., 2023).
- Lab services (GC-MS or FTIR) — accurate purity; available as harm-reduction drug-checking in some regions (Energy Control Spain, DIMS Netherlands, DrugsData USA).
Sources: Full references for the citations in this submodule (Casale & Waggoner, 1991; Brzezinski et al., 1994; Larocque & Hoffman, 2012; Tallarida et al., 2014; Lambdin et al., 2023; DEA, 2024; Brunt et al., 2017; Solimini et al., 2017) are listed in the Module 10 Sources section.