NO! You need special shampoo, and you need to use a special fine tooth comb to get out the nits. If over the counter stuff isn't helping your doctor can give you a prescription for stronger stuff called Kwell or something like that.
Be sure you are washing all you linens in hot water, wash or throw out all of your brushes and combs, don't wear the same stuff on your head. The little critters can be on anything that touches your head. Look at every family member's heads, and be sure they are treated too if necessary.
You'll eventually win!