It can sometimes prove difficult to insert the catheter. This is usually because the sphincter muscle is closed. If you are tense and find it difficult to relax, a good tip is to cough a few times. The sphincter will then open up, and it will be easier to insert LoFric®. You can also try pushing the catheter gently against the opening of the urethra. Men with a narrow urethral passage can also ask for a coudé catheter from the LoFric® product range, which is a catheter with a slightly curved tip to help navigate the curved urethra.
Generally, LoFric® is easier to insert than regular catheters, even for those with spastic sphinters.