Olbas cough syrup is very effective at stopping a cough. When I develop a truly nasty cough, it will take about 2 or 3 doses (according to directions) to completely calm my cough. It also helps break up the “nasty stuff” so you can get over it faster. I have been using Olbas products for years because they work, and I highly recommend all their products. I do not believe there is anything better on the market, prescription or otherwise, and they are safe. I love Olbas.