The gentianella, as mentioned above, is "cousin" of the greater gentian (or yellow). Each of these variants retains a different active principle or that can be used for other symptoms. It is always a good idea to consult a doctor or an equivalent expert if you are taking it, so that you can receive the most correct information on the dosage based on your symptoms, without running the risk of confusing this or that variety. Expert advice is always useful and reassuring, certainly safer than a do-it-yourself botched!
Like most medicinal plants, gentianella and its active ingredients should never be taken in the event of breastfeeding or pregnancy. They can also be harmful if you suffer from gastritis and ulcers.