Valbazen (albendazole), is a benzimidazole anthelmintic that is used extra-label (off-label) in poultry, waterfowl, and game birds. Albendazole is one of the more effective dewormers at killing most species of worms that infect poultry, waterfowl, and game birds. It is effective against roundworms, capillary worms, cecal worms, gizzard worms, gapeworms, and possibly some species of tapeworms.

Valbazen
Active ingredient113.6% albendazole (113.6 mg/ml

Dosing infomation
WormsDose
Large roundwormsGive 0.08 ml per pound of body weight orally, repeat in 10 days.
Cecal wormsGive 0.08 ml per pound of body weight orally, repeat in 10 days.
Capillary wormsGive 0.08 ml per pound of body weight orally, repeat in 10 days.
Gape wormsGive 0.08 ml per pound of body weight orally for 3 consecutive days.

This article explains how to give liquid medications orally:
Safely Administering Oral Medications to All Poultry and Waterfowl

Albendazole is not labeled for use in poultry, so please consult your vet for proper egg and meat withdrawal times.
Valbazen can be used with ivermectin and praziquantel
Warning. Toxic to pigeons, doves, and crias.
Drug interactions - TBD

References:
http://www.poultrydvm.com/drugs/albendazole
https://parasitipedia.net/
Plumb's Veterinary Drug Handbook, 7th Edition - Donald C Plumb
Clinical Avian Medicine