Fliban 100 mg contains Flibanserin, which is primarily used to treat premenopausal women with hypoactive sexual desire disorder (HSDD). While back pain is not listed as one of the common side effects of Flibanserin, some individuals might experience it due to various reasons, including:

General Side Effects: While back pain is not a common side effect, some medications can cause general discomfort or musculoskeletal pain as an unusual side effect.

Indirect Effects: Sometimes, the physical effects of a medication, like changes in activity levels or posture due to fatigue or other symptoms, can indirectly lead to back pain.

Individual Variability: Everyone's body reacts differently to medications. While not common, individual reactions can vary, and back pain might occur in some cases.

If you experience back pain or any other unusual symptoms while taking Fliban 100 mg, it’s important to consult with your healthcare provider. They can help determine whether the medication is the cause and advise on the best course of action, which might include adjusting the dose or switching medications.