SR-17 Taper Calculator

SR-17018 is Schedule I as of August 27, 2026. DEA scheduled it under its legal name, 5,6-dichloro desmethylchlorphine, and possession is a federal offense. This calculator stays up because people mid-taper need the stepdown schedule; it is not a plan you can legally start. See SR-17 for what the order covers and what to do if you’re partway through.

SR-17 has never been studied in humans. All efficacy and safety data is rodent. The community protocols below are documented in detail on the SR-17 page; this calculator does the day-by-day math from your inputs. SR-17 is still a mu-opioid agonist, produces its own dependence and withdrawal, and comes from an unregulated supply. Read the full page before committing to either protocol.

Simple mode

Simple opens first. Enter your current 7-OH dose and choose how many times you take it each day. The calculator multiplies those inputs to find your total daily 7-OH amount. That daily amount selects the SR-17 target from this community-developed ladder:

• Under 100 mg of 7-OH per day: 50 mg of SR-17 per day
• 100–299 mg per day: 150 mg of SR-17 per day
• 300–999 mg per day: 225 mg of SR-17 per day
• 1,000 mg or more per day: 300 mg of SR-17 per day, adjustable up to 400 mg

The calculator divides that daily SR-17 target across your current dosing frequency, up to six times per day. If that would require more than 100 mg of SR-17 at once, it adds enough SR-17 administrations to stay at or below 100 mg. At the 50 mg tier, a three-dose source schedule uses two 25 mg SR-17 doses. Five- and six-dose source schedules use four 12.5 mg SR-17 doses. These divisions keep the daily target at 50 mg in quarter-tablet increments. Your 7-OH frequency does not change during the 7-OH reductions. The result shows the rounded daily amount and the total supply required in milligrams and 50 mg tablets. No human dosing study supports this community-derived conversion.

The 7, 10, and 14-day choices cover the complete cross-taper. SR-17 starts while 7-OH falls to zero. The plan holds SR-17 for one or two days, reduces its daily frequency in stages, and cuts the final SR-17 dose before stopping. The final amount rounds to a 12.5 mg quarter-tablet increment.

• 7 days: starts with half of the current 7-OH dose and stops 7-OH on Day 3.
• 10 days: keeps the current 7-OH dose on Day 1 and stops it on Day 4.
• 14 days: adds a 12.5% 7-OH step and stops it on Day 5, with a longer SR-only runway.

Advanced mode

The SR-17 protocol is a cross-taper, not a single-substance taper. The calculator generates four sequential phases plus an optional allergy-test day:

1. Phase 0 · Allergy test (~10 mg SR-17, wait several hours).
2. Phase 1 · Preload. SR-17 ramps to full dose while 7-OH (or MGM-15 / MIT-A / pseudo) stays unchanged.
3. Phase 2 · 7-OH cross-taper. 7-OH drops to zero — standard is cut-in-half then stop (2 days), custom is N equal cuts.
4. Phase 3 · Hold. SR-17 only, at the preload total.
5. Phase 4 · SR-17 taper down. SR steps down to your jump-off, then stop.

Defaults: a 3-day preload at 50 mg × 3 = 150 mg/day, standard cross-taper, 4-day hold, standard step-down (100 → 75 → 50 → 25 → jump). The SR-17 page documents the protocol with a 1-day preload as the textbook version; the calculator defaults to 3 days because most readers coming through here are on synthetics or stacks where the longer runway tends to work better. Drop it back to 1 for pure short-acting 7-OH, raise it further for harder cases.

When to extend the preload further

The 3-day default is the calculator’s middle-ground choice. Push it higher (4–5 days) if you’re stacking multiple compounds, coming off a high-dose pseudoindoxyl habit, or have a history of rough transitions where SR didn’t have enough time to settle before the 7-OH cuts started. Drop it back to 1 day if you’re on pure short-acting 7-OH and want the textbook-fast version on the SR-17 page.

What the calculator doesn’t do

• It doesn’t source SR-17 for you. The SR-17 page covers what to look for and avoid.
• It doesn’t tell you what to do instead. Suboxone, tapering with kratom leaf, and cold turkey with helper medications are the paths still open.
• It doesn’t model interactions with alcohol, benzodiazepines, or other depressants. Don’t combine. Keep naloxone (Narcan) on hand throughout.
• It doesn’t replace community sense-checking. Bring your plan to the Discord before committing.

See also

• SR-17 — the full protocol page, pharmacology, sourcing, legal status
• Other taper calculators on this site
• Helper Medications — what to pair with the post-SR phase
• What is PAWS? — the post-SR tail