Safety First: What Seniors Must Know

Medication Interactions

This is the most important section for seniors considering cannabis. Cannabis is processed by the liver using the same enzyme system (cytochrome P450) that metabolizes many common prescription medications. This means cannabis can change how your medications work.

Blood thinners (warfarin, Eliquis, Xarelto). Cannabis, especially CBD, can increase the blood-thinning effect. This raises the risk of bleeding. If you take blood thinners, talk to your doctor before using any cannabis product.

Blood pressure medications. THC can temporarily raise or lower blood pressure. If you take medications for hypertension, monitor your blood pressure carefully when starting cannabis.

Sedatives and sleep medications (Ambien, benzodiazepines). Combining THC with sedating medications increases the risk of excessive drowsiness, confusion, and falls. Use extreme caution.

Diabetes medications. Cannabis may affect blood sugar levels. Monitor your glucose more frequently if you use cannabis while taking diabetes medications.

Antidepressants and anti-anxiety medications. Some interactions are possible, particularly with SSRIs and benzodiazepines. Discuss with your prescriber.

Heart medications. THC can increase heart rate temporarily. If you have a heart condition, consult your cardiologist before using cannabis.

Alcohol and Cannabis

Combining alcohol and cannabis amplifies the effects of both substances. For seniors, this combination significantly increases the risk of falls, confusion, and impaired judgment.

If you choose to use cannabis, it is safest to avoid alcohol on the days you consume cannabis. If you do combine them, use much lower doses of both.

Fall Risk and Dizziness

Falls are a leading cause of injury in older adults. Cannabis, particularly THC, can cause dizziness, lightheadedness, and impaired balance, especially during the first one to two hours after use.

Reduce your fall risk:

  • Take cannabis only while seated or in bed
  • Avoid standing up quickly after using THC
  • Keep your home well lit and free of tripping hazards
  • Use cannabis in a familiar environment
  • Start with the lowest possible dose

Cognitive Effects

THC produces short-term changes in memory, attention, and processing speed. These effects are temporary and resolve as the drug wears off. However, seniors who already experience mild cognitive changes should be aware that THC may temporarily worsen these symptoms.

CBD does not appear to impair cognition. For seniors concerned about mental sharpness, CBD-only products or very low doses of THC are the safest options.

Long-term cognitive effects of cannabis use in seniors are not well studied. Current evidence does not suggest that occasional low-dose use causes lasting cognitive harm in healthy older adults.

When NOT to Use Cannabis

Cannabis is not safe for everyone. Do not use cannabis if you have:

  • A history of psychosis or schizophrenia. THC can trigger or worsen psychotic episodes.
  • Severe heart disease. THC increases heart rate and may raise the risk of cardiac events in people with unstable heart conditions.
  • A history of cannabis use disorder. If you have struggled with cannabis dependency in the past, be cautious about reintroducing it.

Use extreme caution if you have:

  • Liver disease (affects how cannabis is metabolized)
  • Kidney disease
  • A history of falls
  • Cognitive impairment or dementia

How to Talk to Your Doctor

Many seniors are hesitant to discuss cannabis with their doctor. Here are some tips:

  • Be direct. You can say, "I am interested in trying cannabis for pain (or sleep). Can we discuss whether it is safe with my medications?"
  • Bring a list of your medications. This helps your doctor assess potential interactions.
  • Ask specific questions. "Is there a risk with my blood thinner?" is more useful than "Is cannabis safe?"
  • Do not stop taking prescribed medications without discussing it with your doctor first.
  • Request a follow-up. Ask to check in after two to four weeks to discuss how cannabis is affecting you.

Your doctor may not be an expert in cannabis medicine, and that is okay. The goal is to ensure your doctor knows what you are taking so they can monitor for interactions and adjust your care as needed.