To relieve an acute neck cramp, you can use over-the-counter pain relievers like ibuprofen or acetaminophen to reduce pain and inflammation. Applying a topical diclofenac gel or a menthol-based ointment directly to the affected area can also provide localized relief. For severe stiffness, a doctor may prescribe a muscle relaxant such as cyclobenzaprine. Resting your neck, applying a warm compress, and avoiding sudden movements will help the muscle relax. Please consult a healthcare professional if the pain worsens, or if you experience numbness, tingling, or weakness radiating down your arm.