Patients’ Guide to Medical Cannabis Dosage

Getting medical cannabis dosage right is a must for safe and effective consumption. The right dosage will maximize its therapeutic potential while minimizing undesired side effects.

Each patient's body responds differently to the THC, CBD, and other cannabinoids in MMJ. Individual factors like metabolism, tolerance, medical condition, and the product used all make personalized and mindful dosing key to successful MMJ therapy.

Core Principles of Medical Cannabis Dosage

Several factors underpin the effective and safe use of medical cannabis:

Start Low and Go Slow

"Start low and go slow" should guide all MMJ use. Think of it as a mantra, especially when experimenting with different strains or new products. Understanding your product's onset time and potency is key to getting your dosage right. For example, the THC in edibles will take significantly longer to kick in than inhaling or consuming cannabis sublingually in a tincture.

Overconsumption is possible when patients don’t fully understand the product they’re using. Learning how to tell if edibles are working and what to expect from other consumption methods will help you find the ideal dosage.

Put this mantra into practice in the following ways:

• Begin with microdoses (2.5 mg) and titrate if the desired effect doesn’t kick in: Knowing how your body reacts to different products and what to expect from them is essential to deciding when to top up your dosage.

• Understand how cannabis is measured: MMJ is typically sold in standard weed measurements. Familiarize yourself with these measurements and how they relate to your preferred consumption method.

Individual Factors That Influence Dose

Finding the right dosage for you depends on several individual factors. These include:

• Tolerance level and previous cannabis use: Patients with experience of adult-use or medical marijuana tend to have built up a higher tolerance level. These patients may need a higher dose to achieve the desired effects.

• Metabolism and body chemistry: Understand the relation between cannabis and metabolism. Patients with a slower metabolism will process the THC in MMJ more slowly than those with a faster metabolism. This is important to note, especially when dosing products with delayed-onset times.

• Conditions being treated: Stronger or more debilitating symptoms may require a higher dose.

• Product potency and cannabinoid profile: Some strains contain significantly more THC than others. Highly potent products like cannabis concentrates will be consumed in much smaller doses than flower. With dabs, for example, start with a serving the size of half a grain of rice.

  
  

Top tip: THC levels in cannabis tend to be much higher than in the past. It's recommended that patients who have taken a break from cannabis start again with caution, as the product may be significantly more potent than they remember.

Note that patients in Arizona 18 years of age and above can purchase consistently high-quality marijuana products from licensed medical dispensaries with a valid medical marijuana card (caregivers make purchases on behalf of minor patients). Cardholders also benefit from higher possession limits and exemption from Arizona’s 16 percent excise tax on adult-use sales.

Purchasing Regulated MMJ Makes Dosing Easier

Purchasing medical-use cannabis with an MMJ card makes dosing easier as it's subject to strict controls and regulations. These include growing the plants in a controlled environment and accurately labeling the cannabinoid content. Choosing properly labeled products means you always know what you're consuming and in what quantities.

Top Tip: Bear in mind that homemade products like edibles may have inconsistent levels of THC from portion to portion, even when made with lab-tested cannabis. 

Medical Cannabis Dosing Chart

The right dose requires two vital pieces of information: the dose of THC you're consuming and the product's onset time. Beginners to the MMJ world are advised to start with microdoses as they build up tolerance. This is to avoid potential adverse effects.

The following doses are recommended for safe and effective MMJ consumption:

Administration Method	Beginner Dose (THC)	Regular User Dose (THC)	CBD-Dominant Dose
Inhalation (smoking/dabbing/vaping)	1–2.5 mg THC per session	5–10 mg per session	—
Edibles	2.5–5 mg THC	5–10 mg THC	25–50 mg CBD
Tinctures/Sublinguals	2.5–5 mg THC	5–10 mg THC	15–30 mg CBD

How Medical Cannabis Works: Onset and Duration by Method

The effects of medical cannabis vary depending on the ratio of cannabinoids, the strain, and the consumption method used. Different balances of THC or CBD will influence how a product works in the body. For example, a high-THC strain is likely to produce stronger effects than a more moderate strain.

How you consume your MMJ also impacts how quickly it works and how long the effects last. Inhaled cannabis produces a faster onset but shorter duration. Conversely, edibles take much longer to activate but last several hours. These differences play an important role in determining appropriate dosing.

Take into account the following onset times when consuming medical cannabis:

Method	Onset Time	Peak Effects	Duration
Inhalation (smoking/dabbing/vaping)	Seconds–minutes	~15–30 min	2–4 hr
Edibles	30–90 min	2–3 hr	6–10 hr
Tinctures (sublingual)	15–30 min	1–2 hr	~4–6 hr

Cannabis Dosing for Common Conditions

Different qualifying conditions may respond better to high THC or CBD-rich strains in distinct quantities or ratios. Others benefit from full-spectrum products. 

Chronic Pain

Managing pain is highly individual. Finding the right dose may be a case of experimenting with the best weed strains for pain relief, products, and CBD:THC ratios to find what works for you. Work with your doctor to find the products and dosage that best alleviate your pain.

Research suggests that a mix of CBD and THC may be most effective for pain relief. The 2023 Review of Medical Cannabis Studies Relating to Chemical Compositions and Dosages for Qualifying Medical Conditions, commissioned by the Minnesota Department of Health, reported that:

• A review of observational studies reported average daily doses of 1-2 g per day. Most of these studies indicated higher doses of THC than CBD (page 13 of the PDF).

• Pain relief improved in line with an increase in the proportion of THC compared to CBD for neuropathic pain (page 23 of the PDF).

An expert consensus study on medical cannabis dosing for chronic pain also reported that an ideal treatment schedule starts with CBD, then adds THC (see Figure 2). The recommended dosage according to this consensus study is:

• A starting dose of ~10 mg/day of CBD

• Titration up to ~40 mg/day

• Add THC if necessary at a starting dose of  ~2.5 mg/day. (typical effective THC dose: ~10 mg/day). The maximum recommended dose of THC is ~40 mg/day. However, this dose is only recommended with professional oversight.

Nausea/Appetite Stimulation

Managing nausea and vomiting is key to improving the quality of life of many patients going through chemotherapy or other treatments. Similarly, stimulating appetite is a vital part of facing conditions like HIV/AIDS. 

Recent studies indicate self-titration of up to 30 mg of THC and 30 mg of CBD per day could be helpful in abating nausea and vomiting. A lower dose is recommended by the FDA for cases of chemotherapy-induced nausea and vomiting treated with dronabinol. In this case, three to four 5 mg doses are recommended. 

The Australian Department of Health, Disability and Aging recommends low starting doses. Patients should titrate this dose if ineffective until the toxicity outweighs the benefit. They also note the possible efficacy of high-THC medicinal cannabis products.

Note: Cannabis use is never advised as a remedy for nausea and/or vomiting during pregnancy.

Anxiety, Stress, and Depression

Anxiety, stress, and depression aren't qualifying conditions in Arizona. However, periods of poor health often bring on negative emotional as well as physical effects. THC has been found to have significant anxiolytic properties, as have some of the common terpenes found in cannabis. This makes them viable alternative therapies for many patients with qualifying conditions.

Research suggests that low doses of THC could reduce anxiety. However, larger doses could compound negative emotions. Research has also shown CBD at doses of 300-400 mg to reduce anxiety in both the long and short term.

How to Calculate the THC Content by Intake Amount

Calculating THC intake across different cannabis products involves converting the concentration of your product (its percentage of THC) into milligrams of THC. The way THC content is calculated depends on the product type:

Flower

THC in cannabis flower is listed as a percentage (%). Use the following formula to convert each strain’s percentage of THC into milligrams: 

THC (mg) = weight (g) × 1000 × THC%

Example:

• 0.25 g of flower at 20% THC

0.25 × 1000 × 0.20 = 50 mg THC 

Concentrates

THC content in cannabis concentrates is much higher than in flower. Use the same formula as with flower to calculate the THC content in your dab:

THC (mg) = weight (g) × 1000 × THC%

Example:

• 0.05 g dab at 80% THC

0.05 × 1000 × 0.80 = 40 mg THC

Vapes

THC in vapes is typically labeled as milligrams of THC per cartridge or as a percentage of THC. Calculate around 2–5 mg THC per puff. In any case, start low and go slow. Try one puff and wait to feel the effects before taking another.

Edibles

Edibles purchased in a medical cannabis dispensary are pre-labeled with their THC content per serving. Be mindful of serving size, as each unit could be more than one serving.

Use the same formula as above to calculate THC in homemade edibles:THC (mg) = weight (g) × 1000 × THC%

Be aware that THC in homemade edibles may not be consistent in each serving.  

Sublingual Tinctures

THC in sublingual tinctures is labeled as milligrams of THC per milliliter. This makes the formula:

THC (mg) = dose (ml) × mg/mL

Example:

• 30 mg/mL tincture

• 0.5 mL dose

0.5 × 30 = 15 mg THC

Remember that even with careful dosing, two products with the same amount of THC may feel different. Your metabolism, tolerance, and how you consume your product all influence how your body perceives the dose of THC.

Safe Medical Cannabis Consumption

Consuming MMJ safely and effectively isn't about maximizing cannabinoid content. It's about getting the right balance for you and your condition. Correct dosage is a crucial factor in enjoying your experience while avoiding the unwanted side effects that come from overconsumption.

What Are the Symptoms of a THC Overdose?

Typical symptoms of a THC overdose include severe anxiety, raised heartbeat, nausea or vomiting, and (in extreme cases) psychosis or loss of consciousness.

How to Avoid THC Overconsumption

The best way to avoid THC overconsumption is to understand your product and its THC content. Products like cannabis extracts tend to contain high levels of THC. This makes precise dosing essential to its safe and effective use. Avoid the overwhelming, intoxicating effects of potent MMJ products by reading the product label, asking for help from your doctor, and starting with smaller doses.

Personalize Your MMJ Dosage

Finding the right medical cannabis dosage takes patience, awareness, and a willingness to adjust based on how your body responds. Starting low, increasing gradually, and choosing regulated products will help you enjoy the therapeutic benefits of cannabis while minimizing unwanted side effects.