Cannabis-Based Drugs Risky for Older Patients with COPD

By Pat Anson, PNN Editor

While many senior citizens are discovering the benefits of medical cannabis in relieving pain and other health problems, a large new study suggests caution is warranted for those with chronic obstructive pulmonary disease (COPD).

Researchers at St. Michael's Hospital in Toronto say older adults with COPD who take prescription drugs made with synthetic cannabinoids were 64% more likely to die. The odds are even worse for elderly patients with COPD who take high-dose cannabinoids for the first time. New users had a 178% higher risk of being hospitalized for COPD or pneumonia and a 231% increased risk of death.

"Cannabinoid drugs are being increasingly used by older adults with COPD, so it is important for patients and physicians to have a clear understanding of the side-effect profile of these drugs," says lead author Nicholas Vozoris, MD, a respiratory specialist at St. Michael's and assistant professor at the University of Toronto.

"Our study results do not mean that cannabinoid drugs should be never used among older adults with COPD. Rather, our findings should be incorporated by patients and physicians into prescribing decision-making. Our results also highlight the importance of favouring lower over higher cannabinoid doses, when these drugs actually do need to be used."

The study analyzed the health data of over 4,000 older adults diagnosed with COPD who took either nabilone or dronabinol, two medications made with synthetic cannabinoids that are used to treat nausea, vomiting and loss of appetite.

The findings, published in the journal Thorax, suggest that nabilone and dronabinol may cause sedation and suppress breathing in patients whose health is already compromised by COPD, a progressive lung disease that causes difficulty breathing and chronic coughing.

"Older adults with COPD represent a group that would likely be more susceptible to cannabinoid-related respiratory side-effects, since older adults less efficiently break down drugs and hence, drug effects can linger in the body for longer,” said Vozoris.

“Cannabinoids may not be any safer to use among older adults with COPD than opioids, which are also associated with a heightened risk of respiratory- related morbidity and mortality. While further research is needed to confirm the safety profile of cannabinoid drugs among older adults with COPD, our findings should be taken into consideration in prescribing decision making in this population.”

Cannabis and Menopause

While high doses of cannabinoids may not be appropriate for older patients with COPD, many middle-aged women are using cannabis to treat symptoms of menopause.

According to a small study being presented at the annual meeting of The North American Menopause Society, over one in four women have either used or are currently using cannabis to manage menopause symptoms.

The study involved 232 female military veterans (average age of 56) living in Northern California. Over half reported hot flashes and night sweats regularly. Twenty-seven percent said they had used marijuana to help battle menopause symptoms, while another 10% said they were interested in trying cannabis.

“While the therapeutic use of cannabis by veterans is not altogether uncommon, this study is among the first to highlight veterans’ use of marijuana for this particular condition. Given cannabis’ relatively high rate of use among the women in this cohort, scientists and others would be well-advised to further explore its safety, efficacy, and prevalence among women experiencing menopause,” said Paul Armentano, Deputy Director of NORML, a marijuana advocacy group.

A 2018 survey of over 2,700 elderly patients in Israel found that medical marijuana significantly reduced their chronic pain without adverse effects. Nearly one in five patients stopped using opioid medication or reduced their dose.

High Use of Opioids by Older Adults with COPD

By Pat Anson, Editor

Canadian researchers have found significantly high rates of opioid use among older adults with chronic obstructive pulmonary disease (COPD), according to a large study published in the British Journal of Clinical Pharmacology. Over half of the patients received a new opioid prescription after their COPD diagnosis.

"The new use of opioids was remarkably high among adults with COPD living in the community," said Nicholas Vozoris, MD, a respirologist at St. Michael's Hospital in Toronto. "The amount of opioid use is concerning given this is an older population, and older adults are more sensitive to narcotic side effects."

The study is based on records for more than 120,000 adults in Ontario age 66 and older with COPD, a progressive lung disease that makes it harder to breathe. COPD causes coughing, wheezing, shortness of breath, chest tightness and other symptoms. Most people who have COPD smoke or used to smoke, according to the National Institutes of Health.

Between 2003 and 2012, 70 per cent of the COPD patients who lived in their own home were given a new opioid prescription, while about 55% of those living in long-term care facilities received a new opioid prescription. Many were given multiple opioid prescriptions, early refills, and prescriptions that lasted more than 30 days.

Opioids might be prescribed more frequently among older adults with COPD to treat chronic muscle pain, breathlessness and insomnia.

"Sometimes patients are looking for what they think are quick fixes to chronic pain and chronic breathing problems," said Vozoris. "And physicians sometimes believe that narcotics may be a quick fix to COPD symptoms."

Common side effects of opioids in older adults include falls and fractures, confusion, memory impairment, fatigue, constipation, nausea, vomiting and abdominal pain. Vozoris says opioids may also negatively affect lung health by reducing breathing rates and volume, which can result in decreased blood oxygen levels and higher carbon dioxide levels.

"This is a population that has chronic lung disease, and this drug class may also adversely affect breathing and lung health in people who already have chronically compromised lungs," he said.

Most of the opioid prescriptions were written by family physicians, usually for pain medications that combine an opioid with acetaminophen.

"Patients and prescribers should reflect on the way narcotics are being used in this older and respiratory-vulnerable population," said Dr. Vozoris. "They should be more careful about when narcotics are used and how they're being used."

A study published in Clinical Interventions in Aging warned about the risk of “polypharmacy” in older adults, who often take multiple medications written by different providers.

“The elderly population is especially challenging when one has to consider all of the pharmacodynamic changes that occur with normal aging. The side effect profile of opiates is similar for all age groups; however the elderly population is at a greater risk for these side effects given their comorbidities and high incidence of polypharmacy. Using opiates appropriately and at the most efficacious dosage for the severity and type of pain becomes crucial in the elderly,” the study said.