CBD dosage – evidence-based titration protocol

TL;DR

• Start-low-go-slow: 10 mg 2×/day, +10 mg every 3 days.
• Anxiety (SAD): 25-75 mg/day (Bergamaschi 2011, Linares 2019).
• Chronic pain: 50-200 mg/day.
• Epilepsy: 5-20 mg/kg/day (clinical, Epidyolex).

How much CBD is in my oil?

Rule of thumb: oil % × 10 = mg CBD per ml. A 10 % oil contains 100 mg/ml; a standard drop ≈ 0.05 ml = ~5 mg CBD. A 5 % oil → ~2.5 mg per drop. Always check the COA – actual volumes vary by ±10-15 %.

Titration protocol (adults)

• Day 1-3: 10 mg morning + 10 mg evening (full-spectrum oil).
• Day 4-6: 20 mg morning + 20 mg evening.
• Then +20 mg every 3 days until effect.
• Max. 70 mg/day without medical supervision (FOPH, per EFSA).

A four-week titration protocol

A slow ramp beats a start dose picked by feel. Week 1: 5 mg twice daily sublingually, logging effects and side effects (tiredness, dry mouth, loose stools). Week 2: move to 10 mg twice daily if nothing adverse appears. Week 3: adjust timing – most of the dose in the evening for sleep problems, evenly spread for anxiety. Week 4: either go to 20 mg twice daily or stay at the effective dose. If 60–80 mg a day does nothing after four weeks, the problem is usually absorption or the product rather than the dose – change the delivery format instead of pushing higher.

Swiss regulatory framework and THC accumulation

In Switzerland, a legal limit of less than one percent total THC applies to over-the-counter CBD products. This value is generous compared to neighbouring European countries, but poses an often underestimated challenge when dosing full-spectrum preparations. Anyone who consumes very high daily doses of Swiss full-spectrum CBD oil inevitably also ingests measurable amounts of THC. Since a strict zero-tolerance policy with a detection limit of 1.5 micrograms of THC per litre of blood applies to Swiss road traffic, careless dosing can lead to unforeseen legal consequences when driving.

Consumers should therefore be aware that the choice of product has a direct impact on dosing safety. While isolates theoretically do not cause THC accumulation, full-spectrum extracts offer the synergistic entourage effect but require particular caution at higher dosages. In case of uncertainty or suspected accidental overdose with accompanying symptoms, Tox Info Suisse provides an initial point of contact via the telephone number 145. For medical applications, obtaining a medical prescription has been the recommended route since the legislative amendment of August 2022 anyway, as medical cannabis has since been accessible without a BAG exceptional permit.

• Consideration of the Swiss limit of less than one percent total THC for full-spectrum oils.
• Strict compliance with the Swiss Road Traffic Act and the THC limit of 1.5 micrograms per litre of blood.
• Use of isolates when driving is a professional necessity to avoid THC accumulation.
• Contacting Tox Info Suisse (telephone 145) in the event of acute intolerance or symptoms of overdose.

Factors influencing bioavailability

The nominal dose on the label of a CBD product rarely corresponds to the amount that actually reaches the bloodstream. This difference is determined by bioavailability, which depends heavily on the chosen route of administration. With sublingual ingestion—i.e. dripping CBD oil under the tongue—part of the active ingredient is absorbed directly through the oral mucosa. This bypasses the liver's so-called first-pass effect, which accelerates the onset of action and noticeably reduces the required dose compared to pure oral consumption via capsules or food.

If, on the other hand, CBD is swallowed, for example in the form of capsules or enriched foods, the substance must pass through the gastrointestinal tract. The liver metabolises a large proportion of the cannabidiol before it reaches the systemic circulation. To optimise bioavailability during oral ingestion, consumption alongside fatty meals is recommended, as CBD is lipophilic. This can multiply the absorption rate, which is why the dose may need to be adjusted downwards in the event of dietary changes or altered times of ingestion to avoid unwanted fatigue.

• Sublingual absorption utilises the oral mucosa for a faster onset of action and higher efficiency.
• Oral consumption via capsules is subject to the first-pass effect and usually requires higher dosages.
• Simultaneous ingestion with healthy fats significantly increases the bioavailability of lipophilic cannabinoids.
• Individual adjustment of the dose when changing the route of administration to avoid dosing errors.

Interactions with Medications and the Cytochrome P450 System

A critical, often neglected aspect when determining the CBD dose is the interaction with regular medications. Cannabidiol is broken down in the liver via the cytochrome P450 enzyme system, which is also responsible for the metabolism of more than half of all common drugs. CBD acts as a potent inhibitor of certain enzymes in this system. This means that the simultaneous intake of CBD can slow down the rate at which other medications are broken down, leading to an uncontrolled increase in their active substance concentration in the blood and drastically increasing the risk of side effects.

Those affected by this mechanism include blood thinners, beta-blockers, antiepileptics, and various psychotropic drugs. Anyone who regularly takes prescription medications must coordinate the dosage of CBD with their treating physician. Often, a time interval of several hours between doses is required, or the dose of the concomitant medication must be adjusted. Uncontrolled self-medication with high doses of CBD can destabilise the therapeutic levels of important medications, which is why extreme caution and regular monitoring of blood values are indicated here.

• Inhibition of the cytochrome P450 enzyme system in the liver by medium to high doses of CBD.
• Risk of cumulative effects and increased toxicity when taken simultaneously with blood thinners or beta-blockers.
• Necessity of medical consultation in the case of existing drug therapy before starting CBD intake.
• Compliance with staggered intake windows to minimise acute enzymatic interactions.

Documentation and the Personal Dosage Diary

Since the reaction to cannabidiol varies greatly due to genetic factors, body weight, and the individual endocannabinoid system, systematic documentation is the key to success. Without written records, the overview of the subtle nuances of the effect in everyday life is quickly lost. A structured dosage diary helps to record the exact relationship between the number of milligrams taken, the time of intake, and subjective well-being. This prevents unnecessary overdosing and at the same time protects the budget, as the minimum effective dose can be precisely determined.

In addition to the pure amount of CBD in milligrams, the diary should also record the dosage form, accompanying food intake, and primary target parameters such as sleep quality, well-being, or muscle tone on a scale. Undesirable side effects such as mild dry mouth or altered digestion should also be included in this log. After a titration phase of several weeks, this data collection provides a reliable basis for deciding whether the dose should be maintained, slightly reduced, or whether the time of intake should be shifted from the morning to the evening hours.

• Daily recording of the exact amount of CBD in milligrams instead of the mere number of drops.
• Systematic evaluation of target parameters on a simple numerical scale for progress monitoring.
• Recording of accompanying circumstances such as meals and times of ingestion to analyse bioavailability.
• Early detection and documentation of mild side effects to adjust the titration rate.

FAQ