Pharmacology · patient case question
Which medication is most appropriate for the muscular component of this presentation?
Patient case: Painless mandibular deviation on opening with limited range
Patient: Female, 36 years old
Chief Complaint: “When I open, my jaw pulls over to the left side.”
Background: Reports daytime clenching under work stress. No trauma, no prior TMJ treatment. No systemic disease.
Vital Signs: BP 118/74 mmHg · HR 72 bpm
Findings: On opening, the mandible DEVIATES TO THE LEFT and remains deviated at maximum opening. Maximum interincisal opening 32 mm. NO PAIN reported on opening or on joint loading. No clicking or crepitus. Tenderness on palpation of the masticatory muscles on the left.
Show answer and explanation
Correct answer: B. Cyclobenzaprine at night
- A. There is no infection. Antibiotics have no role in temporomandibular disorders.
- B. CORRECT. CYCLOBENZAPRINE is a centrally acting MUSCLE RELAXANT, structurally a tricyclic, that acts on brainstem motor neurons to reduce tonic somatic motor activity. Low-dose nightly use is well established for masticatory myalgia and nocturnal parafunction, and its sedative effect is useful rather than incidental. It is a SHORT-TERM adjunct alongside the measures that actually matter: a soft diet, jaw rest, heat, stretching exercises, stress reduction and an occlusal splint.
- C. An NSAID is a reasonable adjunct where there is inflammatory pain, but this patient reports NO PAIN. Prescribing an anti-inflammatory for a painless muscular restriction treats the wrong target, and diclofenac carries the higher gastrointestinal and cardiovascular risk of the class.
- D. Systemic corticosteroids are not indicated for masticatory myalgia. They are reserved for inflammatory arthritides of the joint, and carry substantial risk for a self-limiting muscular condition.
Note: Sequence the management: reversible and conservative measures FIRST — patient education, jaw rest, soft diet, moist heat, gentle stretching, a stabilisation splint and physiotherapy. Pharmacotherapy is adjunctive and short-term. Irreversible treatment — occlusal adjustment, orthodontics, surgery — is not first-line, and most temporomandibular disorders improve without it.