Buy only products that print milligrams of THC and CBD per serving, then treat any dosage chart by condition as a starting point for a talk with your physician, not a prescription. No official US dosage chart exists because cannabis stays Schedule I at the federal level, and the right amount for you depends on your condition, your tolerance, the route of use, and the THC to CBD ratio in the product. A package marked 100 mg total can hide ten separate doses, so read the per serving numbers before you pay.
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What to Look For Before You Buy
- THC and CBD listed in milligrams per serving, on the package or a lab sheet you can inspect at the counter.
- A stated ratio, written as CBD:THC, such as 20:1, 1:1, or 1:0.
- Batch lab results for potency, pesticides, heavy metals, mold, and residual solvents.
- The extraction type and strain notes, since distillate, live resin, and whole flower behave in different ways.
- A harvest or expiration date, because THC breaks down into CBN as flower ages.
- A format you can split, such as scored gummies, low dose capsules, or a tincture dropper marked in milliliters.
Starting Ranges Discussed for Common Conditions
These bands come from patient surveys and clinical literature that clinicians review with new patients. They are not doses to take on your own, and your doctor may set something different based on your history and other medications.
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- Chronic pain: 1 to 2.5 mg THC per dose at first, moving toward 2.5 to 5 mg, often paired with 10 to 25 mg CBD.
- Anxiety and mood: CBD dominant, with THC held at 1 to 2.5 mg or lower, since a large THC load can raise heart rate and worsen worry.
- Insomnia: 2.5 to 5 mg THC in the evening, sometimes with 5 to 10 mg CBD. Some patients need 10 mg, while others feel foggy the next morning at that level.
- Nausea and appetite loss: 2.5 to 5 mg THC, inhaled for fast onset during an acute episode.
- Muscle spasm: 2.5 to 10 mg THC, often in a 1:1 blend with CBD, raised over several weeks.
- Seizure disorders: prescription CBD products only, dosed by a neurologist. Store bought hemp CBD is not a substitute.
Route Matters as Much as the Number
Inhaled flower or vapor takes effect in 2 to 10 minutes, peaks around 15 to 30 minutes, and fades in 1 to 3 hours. An edible takes 30 to 120 minutes to hit, peaks at 2 to 4 hours, and can last 4 to 8 hours. A sublingual tincture sits between the two, with onset near 15 to 45 minutes. The same milligram produces a very different day depending on how it enters your body, which is why a chart alone cannot tell you what to expect.
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Titration Rules That Keep You Safe
- Begin at the low end of the band for your condition, once per day.
- Hold that dose for three to seven days before changing anything.
- Raise by 1 to 2.5 mg of THC at a time, never by doubling.
- Log the time, dose, ratio, and effect so you can see what works.
- Stop and call your doctor if you get chest pain, panic, repeated vomiting, or confusion.
Pitfalls to Avoid
- Guessing a dose from "one gummy" when that gummy holds 10 mg or 50 mg.
- Combining cannabis with alcohol, opioids, or benzodiazepines, which stacks sedation.
- Daily high dose THC use, which builds tolerance and can trigger cannabinoid hyperemesis syndrome.
- Assuming body weight sets your dose. Tolerance and route matter more than pounds.
- Buying unlabeled flower or vape carts with no potency test behind them.
- Driving after an inhaled dose or within six hours of an edible.
FAQ
Is there an official medical marijuana dosage chart by condition?
No. No federal agency publishes one, and state medical programs leave dosing to the patient and physician. Charts you find online are summaries of patient reports and small studies, useful for context but not for self prescribing.
How long should I wait before taking more of an edible?
Wait at least two hours, and give it four if you ate a heavy meal. Taking a second dose at 45 minutes is the most frequent reason people end up uncomfortable for an evening.
Does CBD cancel out THC?
CBD can soften some THC effects such as rapid heartbeat and unease, but it does not erase them in every case. A 1:1 product still delivers real THC.
Should I use the same dose every day?
Tolerance builds with daily use, so many patients take breaks or rotate ratios. Bring your symptom log to your next appointment so your physician can adjust the plan with you.