2x Round worm You don't have your location in your profile, so check with your feed store to see what they have/recommend. The below is my notes which I've collected from threads here. You can also do a forum search (roundworms) for more information.
ZyfendA is more a preventative from what I've read ...
Worms -
- Roundworms - Wazine, Safeguard, Valbazen, Pyrantel Pamoate
- Cecal worms - Safeguard, Valbazen
- Gapeworms - need 3-5 days with Valbazen or Safeguard. Dose depends on which one you use.
- Capillary worms - Hard to treat. Large Safeguard dose for five days is needed. (Safeguard, Valbazen)
- Tapeworms - Praziquantel; fast 24hrs, pea size on bread, repeat 10days, yogurt 2 days after treatment, egg withdrawal
Wazine (piperazine). In Canada piperazine has a zero day egg withdrawal, but it's not labeled for use in laying hens here in the US, so most people wait two weeks past the last treatment. Treat once, repeat in 10-14 days. Can be given orally or in drinking water.
Valbazen (albendazole) - will treat all worms except tapes. Dose is 0.8 ml per pound of body weight orally. Repeat in 10-14 days. Gapeworms require treatment for 3-5 consecutive days. Most people wait two weeks before eating eggs.
Safeguard or Panacur (10% fenbendazole liquid or paste) - Will treat all worms except tapes, but must be given 5 days in a row for gapeworms and capillary worms. Dose is 0.23 ml per pound of body weight five days in a row. Most people wait two weeks before eating eggs. If you decide to get Safeguard, get the liquid because it's much cheaper. One bottle of liquid = 125 ml, five tubes of paste = 125 ml.
WormOut Gel (oxfendazole and praziquantel) - Treats all worms including tapes and it can be given in water. Dose is 47 ml per gallon for two days. Repeat in 10-14 days. Egg withdrawal is probably no less than two weeks.