# 558.300 Ivermectin.
(a) *Specifications.* Type A medicated article containing 2.72 grams ivermectin per pound (g/lb).
(b) *Sponsor.* See No. 000010 in § 510.600(c) of this chapter.
(c) *Related tolerances.* See § 556.344 of this chapter.
(d) *Special considerations.* See § 500.25 of this chapter.
(e) *Conditions of use in swine.* It is used in feed as follows:
| Ivermectin ingrams/ton | Combination in grams/ton | Indications for use | Limitations | Sponsor |
| --- | --- | --- | --- | --- |
| (1) 1.8 | | Weaned, growing-finishing swine: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae); lice (); and mange mites ( var. ) | Feed as the only feed for 7 consecutive days to provide 0.1 milligrams per kilograms (mg/kg) of body weight per day. Withdraw 5 days before slaughter | 000010 |
| (2) 1.8 | Bacitracin methylenedisalicylate, 10 to 30 | Weaned, growing-finishing swine: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae); lice (); and mange mites (var. ); and for increased rate of weight gain and improved feed efficiency | Feed as the only feed for 7 consecutive days to provide 0.1 mg/kg of body weight per day. Withdraw 5 days before slaughter | 000010 |
| (3) 1.8 | Bacitracin methylenedisalicylate, 250 | Weaned, growing-finishing swine: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae); lice (); and mange mites ( var. ); and for control of swine dysentery associated with on premises with a history of swine dysentery, but where symptoms have not yet occurred, or following an approved treatment of disease condition | Feed as the only feed for 7 consecutive days to provide 0.1 mg/kg of body weight per day. Withdraw 5 days before slaughter | 000010 |
| (4) 1.8 to 11.8 | | Adult and breeding swine: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae, and prevention of transmission of infective larvae to piglets, via the colostrum or milk, when fed during gestation); lice (); and mange mites ( var. ) | Feed as the only feed for 7 consecutive days to provide 0.1 mg/kg of body weight per day. Withdraw 5 days before slaughter | 000010 |
| (5) 1.8 to 11.8 | Bacitracin methylenedisalicylate, 250 | Pregnant sows: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae, and prevention of transmission of infective larvae to piglets, via the colostrum or milk, when fed during gestation); lice (); and mange mites ( var. ); and for control of clostridial enteritis caused by in suckling piglets | Feed as the only feed for 7 consecutive days to provide 0.1 mg/kg of body weight per day. Withdraw 5 days before slaughter. Feed bacitracin methylenedisalicylate Type C medicated feed to sows from 14 days before through 21 days after farrowing on premises with a history of clostridial scours | 000010 |
| (6) 18.2 to 120 | | Adult and breeding swine: For treatment and control of gastrointestinal roundworms ( adults and fourth-stage larvae; adults; adults and fourth-stage larvae; spp., adults and fourth-stage larvae); kidneyworms ( adults and fourth-stage larvae); lungworms ( spp., adults); threadworms ( adults and somatic larvae, and prevention of transmission of infective larvae to piglets, via the colostrum or milk, when fed during gestation); lice (); and mange mites ( var. ) | Top dress on daily ration for individual treatment for 7 consecutive days to provide 0.1 mg/kg of body weight per day. Withdraw 5 days before slaughter | 000010 |
[72 FR 37437, July 10, 2007, as amended at 81 FR 17609, Mar. 30, 2016; 81 FR 95005, Dec. 27, 2016; 84 FR 12499, Apr. 2, 2019; 84 FR 39185, Aug. 9, 2019]