I suggested you to use the shampoo called Pregaine. It's $7X at Watson's.
This shampoo has no conditioner. This brand has another essence for hair growth which is proved and recognized by many doctors. But hair will lost again once stopped. I have so many friends said it's really work. There's one for woman and another for man.
If your condition is not bad, just use the shampoo is enough. For details, you may phone to the hotline showed on the box of the product.