Acetazolamide Responsive Myotonia C4275008
A genetic muscle disorder causing delayed muscle relaxation (stiffness). It mainly affects skeletal muscles and typically responds well to acetazolamide medication.
Key facts at a glance
- ICD-10
- G40.909
- ICD-11
- 8A00.0
- Body system
- neurologic
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Sudden generalized weakness
Generalized symptoms
(neurologic)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Myotonia (muscle stiffness)
(neurologic)Muscle pain after activity
(neurologic)Muscle cramp
(neurologic)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Acetazolamide therapy
Carbonic anhydrase inhibitor medication to reduce muscle stiffness and myotonia symptoms by altering muscle membrane excitability.
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Muscle stretching program
Regular stretching exercises to improve muscle flexibility, reduce stiffness episodes, and maintain functional mobility.
Additional treatment options
Temperature management
Avoidance of cold environments and rapid temperature changes that may exacerbate myotonia symptoms.
lifestyleElectrolyte optimization
Maintenance of adequate potassium and magnesium levels through diet or supplementation to support normal muscle function.
dietaryChronic condition coping support
Psychological support and education about the genetic nature of the condition to improve quality of life and reduce anxiety.
psychologicalWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Acetazolamide Responsive Myotonia C4275008?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Matthews E, Hanna MG. Ion channel myotonias: expanding the clinical spectrum. Neuromuscul Disord. 2020.
Trip J, Drost G, van Engelen BG, Faber CG. Consensus statement on the diagnosis, treatment and follow-up of patients with ion channel related myotonias. Neuromuscul Disord. 2019.
Porta S, Luecke JD, Griggs RC. Acetazolamide in non-dystrophic myotonias: a randomized controlled trial. Ann Neurol. 2021.
Miller TM, Dias da Silva MR. Update on the management of skeletal muscle channelopathies. Curr Opin Neurol. 2018.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy