CBD dosage: The complete guide for all indications

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The most important thing: CBD has no standard dosage. Optimal dose depends on indication, body weight, CYP metabolism and form of administration. U-shaped dose-response curve: for anxiety, 300 mg is better than 600 mg.
At a glance:
  • CBD has no standard dosage – optimal dose is indication- and person-specific
  • U-shaped effect curve for anxiety: 300 mg optimal, 600 mg less effective (De Aquino 2020)
  • Bioavailability varies greatly: sublingual 13-19%, capsule 6-19%, vaporizer 34-46%

CBD dosage: Why there is no standard dose

Overview hide
CBD dosage: Why there is no standard dose
Bioavailability: Why the form of intake is crucial
CBD dosage according to indication
The titration scheme: how to find the right dose
CBD and body weight
Side effects and contraindications
FAQ: CBD dosage
Summary

CBD (cannabidiol) does not have an officially defined standard dosage like conventional medicines. The optimal CBD dose depends on the indication, body weight, metabolism (CYP2C19, CYP3A4), form of administration and individual CB1/CB2 receptor density. Added to this is the high variability in the bioavailability of different products. This guide summarizes scientifically proven dosage recommendations according to indication.

Bioavailability: Why the form of intake is crucial

Dosage form Bioavailability Onset of action Duration of action
Oil sublingual 13-19 % 15-45 min 4-6h
Capsule/softgel with lipid 13-35 % (lipid-dependent) 45-90 min 6-8h
Inhalation (vaporizer) 31-56 % 1-3 min 2-3h
Oral without lipid (water soluble) 6-20 % 30-90 min 4-6h
Topical (cream, gel) <1 % systemic 20-60 min local 4-8h local

Practical tip: Always take CBD oil with a fatty meal – increases bioavailability by up to 4× (Millar et al. 2019, Molecules). Coffee, empty stomach = drastically lower absorption.

CBD dosage according to indication

Indication Study dose Initial practice dose Study reference
Anxiety disorders (general) 300-600 mg acute; 25-50 mg daily 25 mg/day, titrate to 75 mg Blessing 2015, Neurotherapeutics; Shannon 2019
Social anxiety (SAD) 300 mg 90 min before (once) 150-300 mg if required Bergamaschi et al. 2011
Sleep disorders 25-300 mg daily 25-50 mg in the evening, titrate to 150 mg Shannon 2019, Perm J
Chronic pain 200-400 mg daily (CBD); often as THC:CBD combination 50 mg/day, increase slowly Johnson et al. 2010 (Sativex)
Epilepsy (Dravet/LGS) 2.5-20 mg/kg/day (Epidiolex) 2.5 mg/kg; titrate over 4 weeks Devinsky et al. 2017, NEJM
Inflammatory diseases 50-300 mg daily 50 mg/day in the morning Preclinical + Walsh 2021
High blood pressure 300 mg daily (7 days) 150 mg/day, monitor blood pressure Walsh et al. 2021, Hypertension
Nausea/chemotherapy Variable; mostly as THC:CBD 1:1 CBD 50 mg + THC 2.5-5 mg Sativex studies

The titration scheme: how to find the right dose

Start low, go slow: the most important principle. CBD has an inverse U-shaped dose-response curve for some indications (e.g. anxiety) – too little and too much can be suboptimal.

Recommended titration scheme:
1st week 1-2: 15-25 mg/day (morning or evening depending on the indication)
2nd week 3-4: 50 mg/day (if sufficiently tolerated)
3rd week 5-6: 75-100 mg/day
4. from week 7: increase to 150-300 mg if necessary, depending on the indication

Keep a symptom diary: Record main symptom (0-10), sleep (0-10), side effects daily. Gives a clear picture after 4 weeks whether and how strongly CBD works.

CBD and body weight

Body weight is less important for standard indications (anxiety, sleep) than for epilepsy. As a rough guide:
– Under 60 kg: 15-25 mg entry, max. 100-150 mg
– 60-90 kg: 25-50 mg entry, max. 150-250 mg
– Over 90 kg: 50 mg entry, up to 300 mg possible

Side effects and contraindications

CBD is well tolerated, but not free of side effects:
– Tiredness (especially high doses): Reduce dose or take in the evening
– Diarrhea (especially CBD isolate without carrier oil): Switch to full-spectrum oil
– Elevated liver enzymes (ALT/AST): Possible at >300 mg daily; consult a doctor if liver disease is present
– CYP interactions: CBD inhibits CYP2C19 and CYP3A4 – increased risk of bleeding with warfarin; levels of benzodiazepines, SSRIs, antihypertensives may increase

The most important dosing principle: start low, go slow – and know the U-curve. De Aquino 2020: For anxiety, CBD 300 mg was optimal, 600 mg less effective. Epidiolex (approved CBD for epilepsy): 10-20 mg/kg/day. Dosage is always indication-specific.
More on the topic:

FAQ: CBD dosage

Summary

CBD dosage depends on the indication: 25-75 mg daily for anxiety and sleep, 50-200 mg for pain, 2.5-20 mg/kg for epilepsy. Bioavailability varies greatly depending on the form of administration – sublingual and inhaled are more efficient than fasting oral intake. Start low, go slow with symptom diary is the only sensible titration strategy. Always clarify CYP interactions with existing medications with your doctor. For specific indications: CBD for sleep disorders, CBD for anxiety and CBD interactions with medication.

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