Tolterodine (the active ingredient in Terol LA 4) is used for an overactive bladder. While a decreased sex drive is not a highly common side effect, sexual difficulties can occasionally occur with this class of medicine. Rest assured, this is manageable and reversible. Excellent alternative treatments are available. Your doctor might suggest switching to a different class of medication, such as mirabegron, which manages bladder symptoms without typically affecting libido. Please do not stop your medication abruptly. I highly recommend discussing this openly with your doctor, who can safely adjust your treatment to restore both your bladder health and your quality of life.