Patient: How much OTC 5% lidocaine is too much? I had laser done yesterday on full legs, arms, face, and underarms. I was told it was okay to have all of it done at one visit. This was my 5th treatment. I used the lidocaine an hour before the treatment and they gave me baby wipes to wipe myself clean before they started. I read that too much lidocaine has serious side effects. How much is too much? I used approx 15g?? How long before a “serious side effect”” to show up? I do feel like a mild have a mild sunburn all over