Other Drugs, Combined Impairment and Drug Toxicity

Assess the Person’s Total Condition

A person can arrive affected by alcohol, cannabis, prescription medication, over-the-counter products or other drugs. Their local alcohol order does not reveal their whole exposure. The SIR course therefore teaches observation of total impairment, not just counting what the establishment sold. A patron who has only one beer in your restaurant can still be too impaired for further liquor service.

Act section 61 prohibits service to an intoxicated person or a person showing signs of intoxication. The safety response also includes assessing whether the person needs medical help. Do not debate which substance is responsible before taking reasonable protective steps. A server’s role is observation, stopping unsafe service, getting assistance and recording facts.

Combined Effects Are Unpredictable

Alcohol can intensify the effects of other substances, especially other depressants. Combinations can produce much greater harm than a person expects from the amount of each product. “Synergy” describes amplification, but it is not an equation in which every combination equals three or four times a dose. The effect depends on the substances, amounts, timing, health and individual response.

Drug toxicity means exposure to a harmful amount of a substance or combination that overwhelms normal functioning. It can occur with legal medication as well as other drugs. Do not assume a prescription label makes drinking alongside it safe. Staff must not recommend dosing, administer someone else’s medication or diagnose the substance from a single symptom.

These are possible associations, not diagnostic tests. A person with blue lips needs emergency assessment regardless of whether anyone saw opioid use. A person who is confused may have a medical condition unrelated to drugs. Do not delay help to obtain a confession.

Cannabis, Including Edibles

Cannabis can affect reaction time, short-term memory, attention, perception and coordination. Combining it with alcohol can increase impairment and collision risk. Cannabis may be inhaled or ingested; edibles do not necessarily leave a smell. The absence of cannabis odour does not exclude its use, while odour alone does not prove that the patron is currently intoxicated.

Health Canada states that effects from eating or drinking cannabis can begin within 30 minutes to two hours, and full effects can take up to four hours. These ranges are informational, not a timetable that predicts every individual’s condition. Continued assessment matters because a customer who seemed well on entry can deteriorate later. Do not promise that waiting a particular number of hours makes them safe to drive.

An original example: a diner mentions having an edible earlier, then starts to lose coordination after a single wine. Staff should stop liquor, obtain a colleague’s help and assess whether safe transport or medical assistance is needed. The correct response is not to calculate a cannabis “standard drink”; SIR has no such dose equivalence.

Caffeine Does Not Cancel Alcohol

Energy drinks can make a customer feel more awake while alcohol-related impairment continues. This can encourage further drinking and overconfidence. Neither an espresso nor an energy drink removes circulating alcohol. A customer’s lively conversation is not enough to establish sobriety when consumption, judgment or coordination raises concern.

Offer non-alcoholic options as alternatives before intoxication develops. Once the guest is showing intoxication, a low-alcohol cocktail is still alcohol and is not an acceptable substitute. Do not use stimulant drinks as a way to resume service or send a patron driving.

Emergency Response and Drink Spiking

If someone is difficult to wake, has abnormal breathing, collapses, has a seizure or appears seriously unwell, call 911 and follow dispatcher instructions. Stop liquor service, stay with the person when safe and have a coworker guide responders to the location. Do not force food, water or coffee on someone who cannot safely swallow. Do not send an unconscious or deteriorating person home in a taxi instead of getting medical assistance.

Drink spiking can involve additional alcohol or other substances without the person’s knowledge. Even a non-alcoholic drink can be spiked. Take a report of suspected spiking seriously, provide a safer location with trusted support, obtain emergency help when needed and involve management. Preserve relevant glasses and recordings under the incident procedure when safe; avoid blaming the person or leaving them with an unverified stranger.

After the immediate danger is managed, record the observed symptoms, timeline, known consumption and action taken. Separate facts from guesses about substances. Communicate the cutoff to all service points and debrief how to improve prevention.

Sources checked October 9, 2026

Official SIR manual, pages 38 and 44–47; Health Canada cannabis information.