Since CORAXIS contains 2.5% moxidectin, studies that demonstrated the safe use of a topical solution containing 2.5% moxidectin + 10% imidacloprid were acceptable to demonstrate the safety of CORAXIS.
Field Studies: Following treatment with a topical solution containing 2.5% moxidectin + 10% imidacloprid or an active control, dog owners reported the following post-treatment reactions:
OBSERVATION | Moxidectin + Imidacloprid n = 128 | Active Control n = 68 |
Pruritus | 19 dogs (14.8%) | 7 dogs (10.3%) |
Residue | 9 dogs (7.0%) | 5 dogs (7.4%) |
Medicinal Odor | 5 dogs (3.9%) | None observed |
Lethargy | 1 dog (0.8%) | 1 dog (1.5%) |
Inappetence | 1 dog (0.8%) | 1 dog (1.5%) |
Hyperactivity | 1 dog (0.8%) | None observed |
During a field study of a topical solution containing 2.5% moxidectin + 10% imidacloprid using 61 dogs with pre-existing flea allergy dermatitis, one (1.6%) dog experienced localized pruritus immediately after product application, and one investigator noted hyperkeratosis at the application site of one dog (1.6%).
Laboratory Effectiveness Studies: One dog in a laboratory effectiveness study experienced weakness, depression and unsteadiness between 6 and 9 days after application of a topical solution containing 2.5% moxidectin + 10% imidacloprid. The signs resolved without intervention by day 10 post- application. The signs in this dog may have been related to peak serum levels of moxidectin, which vary between dogs, and occur between 1 and 21 days after product application.
The following clinical observations also occurred in laboratory effectiveness studies following application of a topical solution containing 2.5% moxidectin + 10% imidacloprid and may be directly attributed to the drug or may be secondary to the intestinal parasite burden or other underlying conditions in the dogs: diarrhea, bloody stools, vomiting, anorexia, lethargy, coughing, ocular discharge and nasal discharge. Observations at the application sites included damp, stiff or greasy hair, the appearance of a white deposit on the hair, and mild erythema, which resolved without treatment within 2 to 48 hours.
Foreign Market Experience: Because the following events were reported voluntarily during post-approval use of the product containing 2.5% moxidectin + 10% imidacloprid in foreign markets, it is not always possible to reliably establish a causal relationship to drug exposure. Adverse events associated with CORAXIS (2.5% moxidectin) are expected to be similar.
The following adverse events were reported in humans: eye irritation, allergic reactions, skin irritation, skin tingling, sore throat and chemical odor. Adverse events reported in dogs topically treated with a topical solution containing 2.5% moxidectin + 10% imidacloprid included: vomiting, diarrhea, bloody diarrhea, salivation, poor appetite, lethargy, weakness, restlessness, agitation, disorientation, ataxia, muscle tremors, seizures, panting, labored breathing, acute pulmonary edema, hives, rash, swollen face and ears, pruritus, erythema, alopecia, hot spots, local discomfort and discoloration of the hair at the application site. Accidental oral ingestion in dogs caused salivation, vomiting, muscle tremor, seizures, mydriasis, ataxia, lethargy, disorientation, agitation and poor appetite.
Adverse events in cats topically treated with imidacloprid + moxidectin for dogs included application site and skin reactions, vomiting, lethargy, agitation and neurologic signs.
To report a suspected adverse reaction, call 1-800-422-9874.