Running out of your medical cannabis prescription before your next dispensing date is stressful. It means gaps in your treatment, an awkward conversation with your clinic, and potentially days or weeks without the medication you rely on.
Good stock management prevents this. Here is what you need to know about tracking your stock, calculating your burn rate, and staying within your prescribed pace.
Why stock management matters
There are three reasons stock management is worth taking seriously:
Continuity of care. Medical cannabis works best when taken consistently. Running out interrupts your treatment and can undo progress you have made in managing your symptoms.
Avoiding gaps. Depending on your clinic and pharmacy, getting a new prescription dispensed can take days or over a week. If you run out before the process completes, you face a gap — and there is no legal way to bridge it outside your prescription.
Legal compliance. Your prescription specifies what you can possess and use. Staying within your prescribed pace is not just practical — it keeps you within the law.
How to calculate your burn rate
Your burn rate is your average daily consumption. The simplest way to calculate it:
- Take the total amount you have used over a period (say, the last 14 days).
- Divide by the number of days in that period.
For example, if you used 7 grams over 14 days, your burn rate is 0.5 grams per day. If your prescription provides 30 grams per month, at that burn rate it lasts about 60 days — you are well within your prescribed pace.
If your burn rate is higher than your prescription pace, you will run out before your next dispensing date. That is the signal to either adjust your consumption or discuss a prescription review with your clinic.
The challenge: calculating burn rate by hand is tedious, especially if you have multiple products. You need to add up usage for each product, sum them, and divide by the number of days. A single missed entry throws the calculation off. This is one area where a tracking app saves real time — Grams Left calculates your burn rate automatically with every dose.
How prescription countdown works
A prescription countdown tells you how many days remain until your estimated next prescription date, based on your current stock and burn rate. It answers the question: "at my current pace, will I run out before my next prescription?"
To calculate it manually:
- Estimate your remaining stock across all products.
- Divide by your burn rate to get "days remaining."
- Compare to the number of days until your next prescription date.
If days remaining is less than days until your next prescription, you are on track to run out early. If it is more, you have a buffer.
Again, this is straightforward in theory but fiddly in practice — especially as your stock and burn rate change with every dose. Grams Left updates your countdown automatically, so you always know where you stand.
What to do if you are running low early
If you notice you are likely to run out before your next prescription date, do not panic. Here are your options:
- Contact your clinic. Explain the situation honestly. Your clinician may be able to issue a prescription early or adjust your quantities. Clinics would rather hear from you proactively than after you have already run out.
- Review your usage. Look at your tracking data. Are there days or times when your consumption is higher? Is there a particular product you are going through faster? Understanding the pattern is the first step to adjusting it.
- Plan ahead for next time. Once you have a clearer picture of your burn rate, you can discuss your prescription quantities with your clinic at your next review. Having data makes this conversation much more productive.
Tracking across multiple products
Many patients have prescriptions that include multiple strains or formats — a daytime flower, an evening flower, and an oil, for example. This makes stock management more complex because each product has its own quantity, its own burn rate, and its own countdown.
The key is to track each product individually and check your overall position at a glance. Running low on one product while having plenty of another is manageable; running low on everything at once is a problem.
Make stock management effortless
Stock management does not have to be a spreadsheet exercise. Grams Left handles burn rate, stock balance, and prescription countdown automatically with every dose you log. It is free for the core tracker, with no card required. If you have been managing stock by hand, start tracking free and see how much simpler it can be.