Tadalafil shows muscle repair potential

Tadalafil, a drug primarily used to treat erectile dysfunction and related to Viagra, has demonstrated unexpected benefits in muscle regeneration in laboratory studies. Researchers from the University of Rome Foro Italico found that the drug may aid in repairing muscle tissue, according to a 2026 study published in Molecular Biology Reports.

Mechanism of muscle repair

The drug's effect is linked to a biochemical process that supports muscle repair. After exercise or injury, muscles release nitric oxide, a gas that activates a signaling molecule called cyclic GMP. This molecule helps initiate the repair process, but its effect is usually short-lived.

Tadalafil's role in prolonging repair

Tadalafil works by inhibiting an enzyme called PDE5, which normally breaks down the cyclic GMP signal. By blocking this enzyme, the drug extends the signal's activity, giving the body more time to repair damaged muscle tissue. This prolongation allows for more effective healing.

Impact on muscle stem cells

In laboratory tests using cultured mouse muscle cells, tadalafil increased the number of myoblasts—cells that can develop into muscle fibers. These myoblasts come from muscle stem cells, also known as satellite cells, which are essential for muscle repair. The drug appears to enhance the survival and multiplication of these cells.

Implications for aging muscles

As people age, the number of these muscle stem cells declines, slowing the body's ability to repair muscle damage. Tadalafil's ability to increase the availability of these cells could offer a new approach to treating muscle injuries and age-related muscle loss. The drug's effects were observed across multiple doses, suggesting a range of potential applications.