Flupirtine

Overview

Structural formula of Flupirtine

Flupirtine is a non-opioid analgesic that was primarily used for the treatment of acute and chronic pain. It is known for its unique mechanism of action as a selective neuronal potassium channel opener, which contributes to its analgesic and muscle relaxant properties.

Mechanism of Action

Flupirtine functions by opening neuronal potassium channels, specifically the Kv7 (KCNQ) family of channels. This action leads to the stabilization of the neuronal membrane potential and a reduction in neuronal excitability. By modulating the activity of these channels, flupirtine indirectly inhibits the release of excitatory neurotransmitters, thereby exerting its analgesic effects.

Pharmacokinetics

Flupirtine is administered orally and is well absorbed from the gastrointestinal tract. It undergoes extensive hepatic metabolism, primarily through the process of N-acetylation. The drug and its metabolites are excreted mainly via the kidneys. The half-life of flupirtine is approximately 6 to 8 hours, allowing for multiple daily dosing.

Clinical Uses

Flupirtine was used in the management of various types of pain, including:

• Acute pain, such as postoperative pain
• Chronic pain, including musculoskeletal pain and tension headaches
• Neuropathic pain

Side Effects

Common side effects of flupirtine include:

• Drowsiness
• Dizziness
• Nausea
• Fatigue

In rare cases, flupirtine has been associated with severe liver damage, which led to its withdrawal from the market in several countries.

Regulatory Status

Due to concerns over hepatotoxicity, the use of flupirtine has been restricted or banned in many regions. The European Medicines Agency (EMA) recommended the suspension of marketing authorizations for flupirtine-containing medicines in 2018.

Related Pages

• Analgesic
• Potassium channel
• Hepatotoxicity