The short answer
There is no standard dose for cannabis lotion. No federal or state agency publishes one, and most labels never tell you how much to rub in. The workable approach: start with a pea-sized dab or a thin layer over the area that hurts, give it 30 minutes, then add more only if nothing changes. Most people settle somewhere between 2 and 10 mg of THC or CBD per application, but that range comes from trial and error, not from a regulator.
Why topicals break the usual dosing rules
Edibles get measured in 5 or 10 mg servings because THC passes through your liver and into your blood. A lotion mostly stays in the skin. Cannabinoids bind to receptors near the surface, and very little reaches circulation. That is why a 200 mg lotion can feel mild while a 10 mg gummy can feel like a lot. The 'start low, go slow' habit still applies, but the ceiling is different and the odds of an uncomfortable psychoactive ride are much lower.
The exception is a transdermal patch. Those are engineered to push cannabinoids through the skin barrier and into the bloodstream. Treat a patch like an edible, not like a lotion.
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How to figure out milligrams per application
Labels list total cannabinoids for the whole container, not per pump. Do the division yourself.
- Find total mg on the package (say, 300 mg THC).
- Find net weight or volume (say, 60 mL).
- Divide: 300 divided by 60 equals 5 mg per mL.
- Estimate what one pump or one fingertip scoop delivers. A full pump is often about 1 mL. A pea-sized dab runs closer to 0.25 mL.
That math turns a vague bottle into a starting point. If your pea-sized dab is around 1 mg, you have room to move up.
A routine that works for most people
- Patch test on your inner forearm. Wait a few hours. Check for redness or itching.
- Apply the smallest amount you can spread across the target area.
- Wait 30 minutes before judging it. Some products take closer to an hour.
- Add a second layer if you feel nothing. Keep the total under whatever mg you decided on.
- Reapply every 3 to 4 hours if it helped and then faded.
Write down what you used and what happened. I look for three data points: mg applied, minutes to relief, and hours of relief. Two or three sessions of notes beat any dosage chart you find online.
Things that change the result
- Heat. A hot shower, a heating pad, or a sauna right after application can increase absorption. Skip that with patches.
- Broken skin. Never apply to cuts, rashes, or sunburn. Absorption jumps and stinging is common.
- Placement. Thin skin (wrists, neck, behind the knee) takes up more than thick skin on the soles or palms.
- Carrier ingredients. Alcohol-based gels dry fast and can irritate. Shea or coconut oil bases spread further, so you may use fewer mg.
- Total cannabinoid load. A 1,000 mg CBD lotion sounds strong, but CBD topicals often need higher mg than THC ones before anyone notices a difference.
What to watch for
Skin reactions are the main risk: contact dermatitis, redness, itching, or a rash that spreads past where you applied. Stop using the product if that happens. If you use a transdermal patch, watch for the usual intoxicating effects, dry mouth, foggy thinking, drowsiness, and do not drive.
Topicals are not a substitute for medical care. If pain is new, severe, or getting worse, see a clinician.