Cannabis Dosing Guide: Start Low, Go Slow

The Short Version

Puerto Rico is a medical-only jurisdiction. Licensed cannabis requires a valid medical patient registration with the JRCM. The single most consistent piece of guidance that applies across every consumption method and every product category is: start low, go slow. The common mistake visitors make at JRCM-licensed dispensaries isn't selecting the wrong product. It's taking a second dose before the first has landed, because the timing of onset varies by method and the psychology of "I don't feel anything yet" is powerful.

This is the dosing reference.

Why Titration Matters More Than A Single Dose

Cannabis tolerance varies widely by individual. Factors that influence how a given dose affects a given person include:

• Prior cannabis experience (tolerance builds, and it also declines after abstinence)
• Body mass (though the relationship is not linear)
• Metabolism, especially for edibles (which pass through the liver before reaching circulation)
• Food intake around dose timing (a full stomach slows edible absorption)
• Product quality and labeling accuracy (regulated programs generally have tighter labeling than informal markets)
• Individual receptor sensitivity (some patients describe dramatic effects from 2.5mg; others feel nothing below 15mg)

The only way to know what a given dose does for a given patient is to take that dose in isolation and observe. The start-low, go-slow framework accepts this variability and works around it.

Edibles

The category where start-low, go-slow matters most, and where most visitor overconsumption happens.

Onset timing

• 30-90 minutes typical onset for oral ingestion
• Empty stomach leans toward the faster end of that range
• Full stomach leans toward the slower end, and the peak may be less intense

Dosing framework for edibles

• First-ever dose: 2.5mg THC
• Occasional user re-entry after a break: 2.5-5mg
• Regular mainland user (adult-use market experience) in PR for the first time: 5mg, given potentially different product-testing rigor between programs
• Experienced patient with established tolerance: whatever the tolerance supports, typically 10-25mg
• High-tolerance user: 25mg+

The common overconsumption scenario

A first-time visitor at 7 PM takes a 10mg gummy. Thirty minutes later they feel nothing. At 45 minutes they feel nothing. At an hour they decide the edible was weak and take a second 10mg gummy. At 90 minutes the first gummy starts landing, and they have 20mg coming at them instead of 10mg. The peak is 2-3 hours in and significantly stronger than planned.

Prevention: wait at least two hours before redosing edibles. Full stop. Read a book. Go for a walk. Watch a movie. Don't eat another gummy "just to see."

What an edible experience can feel like

• Peak effects: 2-4 hours after ingestion
• Duration: 4-8 hours total
• Residual effects: sometimes a next-morning grogginess, especially with higher doses

For a visitor planning an edible-and-beach-day rhythm, a 2.5-5mg dose at 9 PM is a reasonable first session. For an edible-for-dinner rhythm, a 5mg dose taken 90 minutes before the meal lets the effects land at the right time.

Tinctures

The most titratable category. Drops under the tongue (sublingual) absorb faster than edibles but slower than inhalation.

Onset timing

• 15-45 minutes for sublingual absorption
• If swallowed: closer to edible timing (30-90 minutes)

Dosing framework for tinctures

Tinctures are labeled by total bottle mg and typically include a dropper marked in milliliters. A common bottle is 30ml with a total THC content of 300-1000mg. The dropper is usually calibrated so each full dropper is 1ml.

For a 300mg tincture (10mg per ml):

• 2.5mg starting dose: 0.25ml, about a quarter of the dropper
• 5mg: half a dropper
• 10mg: one full dropper

For a 1000mg tincture (33mg per ml):

• 2.5mg starting dose: about 0.075ml — smaller than most droppers show reliably. Consider a lower-strength tincture for precise starting doses.

Why some patients prefer tinctures for anxiety-related use

Tinctures allow precise dosing at levels below what edibles typically offer. A patient who wants to try 1mg or 2mg exactly has a harder time doing that with a gummy marked at 5mg per serving.

Inhalation (Flower, Pre-Rolls, Vape)

The fastest-onset category. Effects within minutes, full peak within 15-30 minutes, duration 1-3 hours.

Dosing framework for inhalation

• One small puff, wait 15 minutes, reassess. This is the most important rule for a first-time inhalation session.
• Two to three small puffs is typically a moderate session for an occasional user.
• A full single joint may be 20-40 puffs. A first-time patient is not the target audience for a full joint.

The puff-counting approach

A 0.5g pre-roll may contain roughly 15-20 puffs of usable material. A 15% THC pre-roll delivers roughly 0.75mg of THC per puff (approximate, depending on absorption efficiency). Three puffs of a 15% pre-roll is roughly 2-3mg of absorbed THC.

For a patient who wants a small session:

• Share a pre-roll with a friend rather than smoking solo
• Take two puffs, put it out, reassess in 15 minutes
• A single puff from a vape cartridge delivers a small, predictable dose

The vape-cartridge advantage for new patients

Vape cartridges are typically labeled with total oil THC percentage (often 60-85%). A single puff from a cartridge delivers roughly 2-4mg of absorbed THC, depending on device and draw length. The short duration (1-2 hours peak) makes cartridges more forgiving for visitors — a mistake goes away faster than an edible mistake.

Tolerance Breaks

For adults 21+ who use cannabis regularly and find that the effects have diminished:

• A 48-72 hour break resets tolerance partially for many patients
• A week or longer resets tolerance significantly
• A month is close to a baseline reset for most patients

For visitors to Puerto Rico coming off a mainland adult-use-market pattern, the PR dispensary shelves may read differently even at familiar dose levels. Start 25-50% lower than mainland dose on the first PR session until the product's effects are known.

The "I Took Too Much" Scenario

What to do if a dose lands heavier than planned:

1. Stay somewhere safe. Your rental, a friend's place, not a busy public area.
2. Hydrate. Water, not alcohol.
3. Eat if the edible is still coming on. A snack can't reverse absorption but can make the experience more manageable.
4. CBD may help. Some patients describe CBD as moderating acute THC effects. A CBD tincture or capsule on hand is part of a responsible kit.
5. Sleep it off. Cannabis is not life-threatening at legal product doses. An uncomfortable few hours resolves.
6. Do not drive. Do not drive. Do not drive.
7. Call someone if the experience becomes distressing. A sober friend, a family member, or if symptoms concern you, a medical professional.

The most important thing: cannabis overconsumption is uncomfortable but not in the same risk category as some other substance overconsumption. Panic makes it worse. Patience resolves it.

Compliance, Plainly

• Puerto Rico is a medical-only jurisdiction. Licensed cannabis requires a valid medical patient registration with the JRCM.
• 21+ with a valid patient registration.
• Verify licensed status — the JRCM maintains the public dispensary licensing list.
• Start low, go slow. 2.5-5mg edibles for first-time or re-entry patients. One-puff-then-wait for inhalation.
• Wait at least two hours before redosing edibles.
• No public consumption.
• No driving under the influence.
• Federal law prohibits transporting cannabis across state or territorial lines, including on flights back to the mainland.

Where to Go Next

• Cannabis pricing at PR dispensaries
• Cannabis for anxiety and stress: PR patient guide
• The Puerto Rico medical-cannabis tourist guide

This is editorial, not medical or legal advice.