A recent study published in BMC Medicine suggests that common diabetes medications may lead to a chain reaction of prescriptions, prompting older adults to take additional drugs solely to manage the side effects of their initial medication.
Researchers analyzed data from two large healthcare databases, encompassing over 387,000 participants with type 2 diabetes. They investigated the frequency with which a second medication was prescribed to manage side effects of the first. The study identified seven potential "prescribing cascades" among 12 medication pairings examined. A prescribing cascade occurs when a new drug is added to treat side effects that are mistakenly interpreted as a distinct medical condition.
Two classes of commonly prescribed diabetes medications, sodium-glucose cotransporter-2 (SGLT2) inhibitors and thiazolidinediones, were found to be part of these cascades.
SGLT2 inhibitors, which help the body excrete excess sugar through urine, have reported side effects such as increased urination and dizziness. The study observed that individuals taking SGLT2 inhibitors were often subsequently prescribed antibiotics for urinary tract infections, antifungals, or medications for an overactive bladder. This association suggests that symptoms like increased urination or infections might be treated with new drugs rather than managing the effects of the SGLT2 inhibitor itself.
Thiazolidinediones, used to enhance insulin sensitivity, can cause adverse effects including swelling, weight gain, and an increased risk of bone fractures, heart failure, liver damage, or low blood sugar. The study found that patients taking thiazolidinediones were frequently prescribed loop diuretics, also known as "water pills," to combat swelling.
Other diabetes medications implicated in prescribing cascades include statins, which can cause lower urinary tract symptoms and sleep disturbances. These effects sometimes led to prescriptions for overactive bladder medications or hypnotics. Additionally, calcium channel blockers, often prescribed for high blood pressure in diabetic patients, can result in swelling in the lower extremities, leading to diuretic prescriptions to manage this symptom.
The study's authors suggest that recognizing adverse drug reactions as side effects of the primary medication, rather than new conditions, could lead to adjustments in the initial prescription. This approach, they argue, could reduce the complexity of treatment regimens and the number of medications patients need to manage.
