I just went throught this with a new rescue beardie...
Panacure will work but it causes them to loose their appetite. When 'force' feeding you should not force their mouths open. You should offer them the liquid food through a syringe by dripping it on their nose--they should lick it up. NEVER try to force their mouths open--especially NEVER pull on their beard to open their mouth! In severe cases you can offer/give fluids by placing syringe in the SIDE of their mouth. The use of a 'probiotic' like Acidolpholiz (spelling?) is also benificial any time they are having eating trouble or if they are on meds (especially antibiotics).
To keep your beardie hydrated during treatment soak them daily. Keeping the cage/tank extra clean is a must to prevent reinfection and to keep the parasites from spreading to your other beardies. Newspaper or papertowels as a substrate is best during treatment for easy cleaning. Remove any particulate (sand) substrate until all fecals are clear.
It took 2 weeks before I noticed an improvement. After the treatment with panacure I used Parazap to help her get her appetite back. I will also be using Parazap once a month (for 3-5 days in a row) as a preventative--both of my beardies take/lick the parazap readily (they seem to love the stuff).