Case Report: Metoprolol-Induced Arthralgia

Various drugs are known to cause musculoskeletal symptoms, such as arthralgias, myalgias, drug-induced lupus and serum sickness.¹ In the rheumatology world, the most commonly recognized drugs that can cause musculoskeletal symptoms are hydralazine, minocycline, fluoroquinolones and, recently, the dipeptidyl peptidase 4 (DPP-4) inhibitor class of medications. Although beta blockers also have a noted side effect of arthralgias, as listed on the product label, there is lack of literature and awareness that this class of medications can cause arthralgias, as well as elevated anti-nuclear antibodies.²

In 1986, Sills documented five cases of self-reported metoprolol-induced arthralgias through the U.S. Food and Drug Administration’s spontaneous reporting system, all of which resolved within days of discontinuing the medication (see Table 1).³ Historically, practolol caused a more severe multisystem immunologic syndrome; however, metoprolol was also found to produce a range of disease severity, from simple arthralgias to multisystem disease.⁴

Case Report

A 59-year-old female presented to the primary care doctor due to six to twelve months of polyarthralgias. Pain was migratory, primarily in the metatarsal joints of both feet, lateral hips and wrists. She had about 30 minutes of morning stiffness in the toes, and fingers of the right hand and low back. Pain improved with non-steroidal anti-inflammatory drugs (NSAIDs), but did not resolve.

Her prior history was significant for fluoroquinolone-induced arthralgias two years earlier after urinary tract infection treatment, as well as plantar fasciitis and trochanteric bursitis, for which she had multiple corticosteroid injections.

The patient had taken levothyroxine and sertraline for several years. She had changed from triamterene-hydrochlorothiazide to metoprolol for blood pressure control about a year earlier.

Her symptoms did not improve with exercises or NSAIDs. Following a podiatry referral, the patient went to a rheumatologist.

The examination was significant for a positive, right Finkelstein maneuver, bilateral first MTP tenderness without swelling or erythema, bilateral greater trochanteric bursa tenderness, and a positive Patrick’s maneuver bilaterally.

A prior pelvic X-ray (see Figure 1) had shown sacroiliac joint osteoarthritis and enthesopathy, which, along with the examination findings, prompted the rheumatologist to order a pelvic MRI.

(click for larger image) Table 1: Five Cases of Self-Reported Metoprolol-Induced Arthralgias⁴

Further workup, including erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), rheumatoid factory (RF), HLA B27, an ultrasound of the hand and wrist and the pelvic MRI were negative.

Metoprolol was discontinued upon the patient’s request while she was undergoing the workup, which resulted in complete resolution of her arthralgias within two to three days after drug cessation.

Discussion

A pelvic X-ray had shown sacroiliac joint osteoarthritis and enthesopathy.