Cenforce 200 mg contains sildenafil citrate at a high dose (200 mg), and muscle aches are a recognized side effect of sildenafil, especially at higher doses. Here's why: 1. Mechanism of Muscle Aches Sildenafil is a PDE‑5 inhibitor that primarily works on blood vessels in the *****, but it can also affect smooth and skeletal muscles elsewhere: Sildenafil increases cyclic GMP (cGMP) in smooth muscle cells, leading to relaxation of blood vessels. Some skeletal muscles are indirectly affected because increased blood flow and cGMP signaling can cause transient changes in muscle tension or metabolism. This can lead to myalgia (muscle aches), usually mild and temporary. 2. Dose-Related Effect At 200 mg, the plasma concentration of sildenafil is higher, so systemic effects beyond the ***** are more noticeable. Muscle aches, back pain, or stiffness are reported more often with higher doses than with 50 mg or 100 mg. 3. Other Contributing Factors Vasodilation: Sildenafil causes relaxation of small blood vessels; sometimes this leads to fluid shifts or minor inflammation in muscles. Exercise or physical strain: If taken near physical activity, the muscles may be more sensitive. Individual sensitivity: Some people metabolize sildenafil slower, prolonging exposure and side effects. 4. Typical Course Muscle aches often start a few hours after taking the dose. They usually resolve within 24–48 hours. Over-the-counter pain relief (like acetaminophen) can help if needed.