Answer
Start with 2.5 mg THC or less. Wait at least 2 hours before a second dose. A 10 mg edible is not a beginner dose. Onset for edibles is 30 to 120 minutes. Peak effect can arrive at 2 to 4 hours.
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Start low
Canada's lower-risk cannabis guidelines list 2.5 mg THC or less as a starting dose. Colorado and CDC guidance says start low and wait. Labels list THC per package and THC per serving. A package can hold 10 servings. Check both numbers.
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Wait 2 hours
Do not take more at 30 minutes. The edible has not finished. Stomach contents, food, and body weight change onset. Set a timer. Wait 2 hours. If effect is absent at 2 hours, add 1 to 2.5 mg. Do not double the first dose.
Check the serving
One serving is not one package. A 100 mg package with 10 pieces gives 10 mg per piece. A 100 mg package with 20 pieces gives 5 mg per piece. Cut a piece to reach 2.5 mg when possible. Use a scale for homemade edibles. THC in homemade butter or oil varies by batch.
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Read the lab test
Ask for a batch lab test. The test lists THC mg per serving and per package. Labels can differ from actual content. A 2015 study in Colorado found some edible labels missed the stated THC content. Store edibles away from children and pets. Keep the package.
Signs of too much
High dose effects include anxiety, fast heart rate, nausea, and panic. These effects pass. Stay seated. Drink water. Do not drive. Call a poison center for severe symptoms or for a child who ate an edible.