Related Experiment Video
Updated: Jun 20, 2026
09:39
Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
Published on: July 29, 2016
Myopathy with concurrent tadalafil and simvastatin.
Maria Pia Gargante1, Marco Vacante, Cristina Russo
1Department of Senescence, Urological and Neurological Sciences Ospedale Cannizzaro, Viale Messina, 95125 Catania, Italy.
Case Reports in Medicine
|September 2, 2009
Summary
Tadalafil and simvastatin drug interaction can cause myopathy. This muscle damage may occur due to their shared metabolism via the cytochrome P450 system.
Area of Science:
- Pharmacology
- Toxicology
- Drug Metabolism
Background:
- Statins, like simvastatin, are commonly prescribed for cholesterol management.
- Tadalafil is a phosphodiesterase type 5 inhibitor used for erectile dysfunction and benign prostatic hyperplasia.
- Drug interactions are a significant concern in polypharmacy.
Observation:
- A 48-year-old male patient on simvastatin experienced progressive myalgia (muscle pain).
- Symptoms developed after the concurrent use of tadalafil.
- Myalgia and associated symptoms resolved within seven days of discontinuing both medications.
Findings:
- The case highlights a potential drug interaction between tadalafil and simvastatin.
- This interaction led to drug-induced myopathy in the patient.
- Shared metabolism via the cytochrome P450 isoenzyme system is the likely mechanism for the myopathy.
Implications:
- Healthcare providers should be aware of the potential for myopathy when prescribing tadalafil concurrently with simvastatin.
- Monitoring for muscle-related adverse effects is crucial in patients taking this drug combination.
- Further research into the pharmacokinetic and pharmacodynamic interactions between tadalafil and statins is warranted.
Related Concept Videos
01:20Myasthenia Gravis: Overview and Treatment
Myasthenia gravis is a neuromuscular transmission disorder characterized by weakness and increased fatigability of skeletal muscles. It is an autoimmune disease affecting approximately one in 2000 people, where antibodies against the α1 subunit of nicotinic acetylcholine receptors are produced.
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...
These antibodies interfere with the function of the nicotinic receptors in three ways: by binding to the receptor and disrupting acetylcholine binding; by causing cross-linking of receptors which leads...
01:21Skeletal Muscle Relaxants: Adverse Effects
Skeletal muscle relaxants are widely used for muscle paralysis and relieving pain following any muscle injury or stiffness. However, depending on the drug type, they can have adverse effects that range from mild to severe. Usually, nondepolarizing neuromuscular blockers have minimal side effects. For example, drugs like d-tubocurarine, cisatracurium, and rocuronium cause hypotension, whereas drugs like baclofen, when stopped abruptly, can lead to the recurrence of spastic conditions.
Unlike...
Unlike...
01:15Myasthenia Gravis: Diagnostic Tests
Myasthenia gravis is an autoimmune condition affecting neuromuscular transmission, causing generalized weakness in skeletal muscles. Initial diagnoses rely on patients' signs, symptoms, and medical history. The challenge lies in distinguishing myasthenia from other muscular dystrophies. An important diagnostic feature is the significant improvement of symptoms after administering anticholinesterase inhibitors.
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
The edrophonium test is a diagnostic tool for myasthenia gravis. It involves...
01:31Skeletal Muscle Relaxants: Therapeutic Uses
Skeletal muscle relaxants are used to relax muscle tone and alleviate painful muscle contractions. However, the choice of skeletal muscle relaxants depends on the duration of the surgical procedure in order to minimize potential side effects. Skeletal muscle relaxants like neuromuscular blocking agents [NMBAs] are commonly employed as adjuvants alongside general anesthetics in clinical settings. NMBAs are also used to maintain controlled ventilation during surgery of the larynx or pharynx as...
01:28Disorders of the Skeletal Muscle
The clinical conditions affecting the skeletal muscle tissue are broadly categorized as musculoskeletal and neuromuscular disorders.
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
Musculoskeletal disorders
Musculoskeletal disorders involve injuries and conditions affecting the skeletal muscles and associated connective tissues. These disorders can arise from acute biomechanical stresses or chronic overuse and can occur across different age groups. Common injuries include sprains, fractures, and muscular strains, often resulting from...
01:22Myasthenia Gravis ll: Pathophysiology
The disease process of myasthenia gravis begins at the neuromuscular junction, where antibodies attack key proteins needed for muscle activation. This immune reaction weakens signal transmission, leading to the characteristic muscle fatigue and weakness that define the condition.Immune-Mediated DamageIn most individuals, antibodies target acetylcholine receptors (AChRs) on the postsynaptic membrane of muscle cells. By blocking acetylcholine binding, these antibodies prevent the nerve signal...