You need any med with the main ingredient Praziquantel. I just used parasite clear twice and it worked. However, I think I would also consider PraziPro. One is a liquid the other is Fizz tabs. Praziquantel is the med for prety much any parasite. Just use it til the you think youve fixed the problem. You may need several treatments.
Should work, says it contains levamisole. To treat camallanus you want either levamisole or fenbendazole, I have not heard accounts of any other medication working. Levamisole has worked for me, it's a common pig and poultry wormer, fenbendazole is a common dog wormer. Fenbendazole will kill invertibrates, levamisole won't, or so I'm told.
How well the stuff in the link will work and how much you'll need to dose depends on the concentration of levamisole. It doesn't look too expensive, but if the concentration of levamisole is low, you might be better off getting a pig or poultry wormer with a higher concentration.