Combination remedies are not dangerous. They are just unlikely to work and if they do you don't know which one of the ingredients has done the trick!! hat Nervatona seems to be more herbal than homeopathic. I have no idea what measurement a pg or an nl is. Does anyone else? Did you mistype it and it should read mg and ml or the "mu" sign? If they are herbal I wouldn't want to take some of those ingredients as they are poisoness!!!