Initial use of pregabalin, patterns of pain-related pharmacotherapy, and healthcare resource use among older patients with fibromyalgia.

OBJECTIVE

To characterize the comorbidities, pain-related pharmacotherapy, and healthcare resource use among older patients with fibromyalgia (FM) newly prescribed pregabalin in clinical practice.

METHODS

Using the PharMetrics database, patients with FM aged 65 or more years (International Classification of Diseases, Ninth Revision, Clinical Modification code 729.1X) who were newly prescribed pregabalin (index event) on or after July 1, 2007, were identified (N = 98, mean age 72.4 +/- 6.4 years; 81.6% female). Prevalence of comorbidities, pharmacotherapy, and healthcare resource use/costs (pharmacy, outpatient, inpatient, total) were examined during the 6-month preindex and postindex periods.

RESULTS

Patients had a variety of comorbidities including various disorders generally associated with an older population, such as hypertension (41.8%), diabetes (22.5%), and coronary artery disease (15.3%). On average, patients received 3.3 +/- 2.3 pregabalin prescriptions; the average number of days of therapy was 121 +/- 88.9. Patients had a high medication burden in both the pre- and postindex periods; opioids were the most commonly prescribed medications (54.1% vs 59.2%); combination therapy was also common, with opioids and antidepressants the most frequent (35% in both periods). Except for the use of selective serotonin reuptake inhibitors, which decreased significantly in the postindex period (24.5% vs 19.4%, P = .0253), there were no changes in use of any of the other medications, including nonsteroidal anti-inflammatory drugs (36.7% vs 32.7%), tramadol (17.4% vs 24.5%), muscle relaxants (18.4% vs 21.4%), tricyclic antidepressants (21.4% vs 18.4%), serotonin and norepinephrine reuptake inhibitors (10.2% vs 12.2%), and anticonvulsants (17.4% vs 21.4%) after initiation of pregabalin therapy. There were decreases in the number of physician office visits and total outpatient visits (both P <.01) and in the proportion of patients with visits to physical therapists (21.4% vs 12.2%, P = .0201); however, there were no changes in healthcare costs (pharmacy, outpatient, inpatient, or total) from the pre- to postindex period.

CONCLUSIONS

These results suggest a substantial medication and comorbidity burden in older patients with FM. Although it is not possible to establish cause-and-effect relationships in claims database studies, results also suggest that the initiation of pregabalin was cost-neutral. Further evaluation is warranted to characterize FM and determine appropriate management strategies in this fragile population.