There is no single medical cannabis dosage chart that fits every person with insomnia. The core buying advice is simpler: choose products that print THC and CBD in milligrams per serving, start at 1 to 2.5 mg THC (or 25 to 50 mg CBD if you avoid THC), and hold that amount for three or four nights before changing it. A chart gives you a starting band, not a prescription. Body weight, tolerance, liver metabolism, and your current medications all shift the number that works for you.
What to look for before you buy
- Milligram labeling per serving and per package, not vague terms like "strong" or "mild."
- A batch-specific certificate of analysis (COA) from an accredited lab, with potency and a screen for pesticides, heavy metals, and residual solvents.
- Harvest and packaging dates. Cannabinoids and terpenes degrade with age and heat.
- A stated ratio of THC to CBD. A 1:1 or 1:2 ratio blunts the THC effect for most people.
- Child-resistant packaging and a dosing tool if you use oil or tincture.
- State-licensed retail only. In the US, cannabis remains federally illegal, so purchase from a licensed dispensary in your state and be 21 or older.
Dosage bands to use as a reference
By THC per dose
- 1 to 2.5 mg: first-time and low-tolerance band. Useful for testing sensitivity.
- 2.5 to 5 mg: most common starting band for sleep onset in new consumers.
- 5 to 10 mg: regular consumers with established tolerance.
- Above 10 mg: higher risk of grogginess, racing heart, and next-day impairment. Increase only with a clinician's input.
By CBD per dose
- 25 to 50 mg: entry band for people who want to avoid THC.
- 50 to 100 mg: middle band, often paired with a small amount of THC.
- 100 to 300 mg: upper band studied in some sleep and anxiety research. Evidence for sleep remains mixed.
By method and timing
- Inhalation (flower or vape): onset in 5 to 15 minutes, effects fade in 2 to 3 hours. Easier to titrate, harder on the airways.
- Sublingual tincture or oil: onset in 15 to 45 minutes, duration 4 to 6 hours. Take it 30 to 60 minutes before bed.
- Edible or capsule: onset in 30 to 120 minutes, duration 6 to 8 hours. Take it 1.5 to 2 hours before bed and expect a longer morning tail.
How to choose a product for sleep
Match the product to the problem. If you struggle to fall asleep, a faster method with modest THC works better than a heavy edible. If you wake at 3 a.m., a longer-acting edible or a balanced THC:CBD oil covers more of the night. People who feel anxious on THC often do better with a CBD-dominant product or a 1:1 ratio. CBN and other minor cannabinoids appear in many sleep products, but the human evidence is thin, so treat them as optional rather than essential. Keep a short log of date, product, milligrams, timing, and sleep quality. Two weeks of notes beats any generic chart.
cannabis dosing calculator for weight
Pitfalls to avoid
- Redosing an edible too soon. Waiting 30 minutes and taking more is the most common cause of an unpleasant night.
- Mixing with alcohol, benzodiazepines, opioids, or sleep aids. Sedation compounds and the interaction can be dangerous.
- Trusting strain names. Two batches of the same name can differ in potency. Read the COA, not the label art.
- Buying unregulated vape cartridges. Contaminants and unknown additives are a real risk.
- Using daily without a break. Tolerance builds within weeks and can worsen sleep quality over time.
- Driving the morning after a high edible dose. Impairment can persist past the point where you feel normal.
FAQ
How many milligrams of THC should I take for sleep?
Start at 1 to 2.5 mg and work up in 1 to 2.5 mg steps. Many people land between 2.5 and 5 mg. Doses above 10 mg raise the odds of grogginess and next-day impairment.
cannabis dosing calculator for weight
Can CBD alone help with insomnia?
Some people report better sleep on 25 to 100 mg of CBD, though controlled research results are mixed. CBD does not produce a high and is a reasonable first option if THC makes you anxious.
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Is a vape or an edible better for sleep?
A vape acts in minutes, which suits trouble falling asleep. An edible lasts longer, which suits middle-of-the-night waking. Edibles are harder to dose because of the delayed onset.
Will cannabis interact with my prescriptions?
Yes, it can. THC and CBD affect liver enzymes that process several drugs, including blood thinners, seizure medications, and some antidepressants. Tell your prescriber and pharmacist what you use.
Do I need a medical card?
It depends on your state. Some states require a medical card for certain products or higher potency limits, while adult-use sales are open to anyone 21 and older.