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Cydectin Injectable Solution

This page contains information on Cydectin Injectable Solution for veterinary use.
The information provided typically includes the following:
  • Cydectin Injectable Solution Indications
  • Warnings and cautions for Cydectin Injectable Solution
  • Direction and dosage information for Cydectin Injectable Solution

Cydectin Injectable Solution

This treatment applies to the following species:
Company: Bayer Animal Health


Injectable Solution for Beef and Nonlactating Dairy Cattle



Contains 10mg moxidectin/mL (5,000 mg/500 mL)

Not for use in female dairy cattle 20 months of age or older (including dry dairy cows), veal calves, and calves less than 8 weeks of age.

For Treatment of Infections and Infestations Due to Internal and External Parasites of Cattle.

Consult your veterinarian for assistance in the diagnosis, treatment and control of parasitism.

Product Description

CYDECTIN Injectable Solution is a ready-to-use, sterile solution containing 1% moxidectin. Moxidectin is an endectocide in the milbemycin chemical class which shares the distinctive mode of action characteristic of macrocyclic lactones. CYDECTIN Injectable is specially formulated to allow moxidectin to be absorbed from the site of injection and distributed internally to the areas of the body affected by endo- and/or ectoparasitism. Moxidectin binds selectively and with high affinity to glutamate-gated chloride ion channels which are critical to the function of invertebrate nerve and muscle cells. This interferes with neurotransmission resulting in paralysis and elimination of the parasite.

Cydectin Injectable Solution Indications

CYDECTIN Injectable, when administered at the recommended dose level of 0.2 mg/2.2 lb (0.2 mg/kg) body weight, is effective in the treatment and control of the following internal and external parasites of cattle:

Gastrointestinal Roundworms

Ostertagia ostertagi - Adults and L4 (including inhibited Larvae)

Haemonchus placei - Adults

Trichostrongylus axei - Adults and L4

Trichostrongylus colubriformis - Adults and L4

Cooperia oncophora - Adults

Cooperia pectinata - Adults

Cooperia punctata - Adults and L4

Cooperia spatulata - Adults

Cooperia surnabada - Adults and L4

Nematodirus helvetianus - Adults

Oesophagostomum radiatum - Adults and L4

Trichuris spp. - Adults


Dictyocaulus viviparus - Adults and L4

Cattle Grubs

Hypoderma bovis

Hypoderma lineatum


Psoroptes ovis (Psoroptes communis var. bovis)


Linognathus vituli

Solenopotes capillatus

Persistent Activity: CYDECTIN Injectable has been proven to effectively protect cattle from reinfection with Dictyocaulus viviparus and Oesophagostomum radiatum for 42 days after treatment, Haemonchus placei for 35 days after treatment, and Ostertagia ostertagi and Trichostrongylus axei for 14 days after treatment.

Management Considerations for External Parasites: For most effective external parasite control, CYDECTIN Injectable should be administered to all cattle in the herd. Cattle entering the herd following this administration should be treated prior to introduction. Consult your veterinarian or a livestock entomologist for the most appropriate time to administer CYDECTIN Injectable in your location to effectively control external parasites.


The recommended rate of administration for CYDECTIN Injectable is 1 mL for each 110 lb (50 kg) body weight to provide 0.2 mg moxidectin/2.2 lb (0.2 mg/kg) body weight. The table below will assist in the calculation of the appropriate volume of injectable which must be administered based on the weight of animal being treated. Be careful not to overdose animals; estimate animal’s body weight as closely as possible or weigh animals individually.

Weight (lb)











Weight (kg)











Dose (mL)











● Do not underdose. Ensure each animal receives a complete dose based on a current body weight. Underdosing may result in ineffective treatment, and encourage the development of parasite resistance.


CYDECTIN Injectable should be administered by subcutaneous injection under the loose skin in front of or behind the shoulder (Figure 1). Needles 1/2 to 3/4 inch in length and 16 to 18 gauge are recommended for subcutaneous injections. Use sterile, dry equipment and aseptic procedures when withdrawing and administering CYDECTIN.

Figure 1. Sites for administration of CYDECTIN Injectable

Human Warnings

Not For Use in Humans. Keep this and all drugs out of the reach of children. For customer service or to obtain product information, including Safety Data Sheet (SDS), call 1-800-633-3796. For medical emergencies or to report adverse reactions, call 1-800-422-9874.

Residue Warnings

Cattle must not be slaughtered for human consumption within 21 days of treatment. This drug product is not approved for use in female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or in calves born to these cows. A withdrawal period has not been established for preruminating calves. Do not use in calves to be processed for veal.

Animal Safety Warnings

Do not use in sick, debilitated, or underweight animals. In foreign countries there have been reports of adverse effects, including death. This product should not be used in calves less than 8 weeks of age because safety testing has not been done in the U.S. in calves less than 8 weeks of age.

Environmental Warnings

Studies indicate that when moxidectin comes in contact with the soil, it readily and tightly binds to the soil and becomes inactive. Free moxidectin may adversely affect fish and certain aquatic organisms. Do not contaminate water by direct application or by improper disposal of drug containers.


● Parasite resistance may develop to any dewormer, and has been reported for most classes of dewormers.

● Treatment with a dewormer used in conjunction with parasite management practices appropriate to the geographic area and the animal(s) to be treated may slow the development of parasite resistance.

● Fecal examinations or other diagnostic tests and parasite management history should be used to determine if the product is appropriate for the herd/flock, prior to the use of any dewormer. Following the use of any dewormer, effectiveness of treatment should be monitored (for example, with the use of a fecal egg count reduction test or another appropriate method).

● A decrease in a drug’s effectiveness over time as calculated by fecal egg count reduction tests may indicate the development of resistance to the dewormer administered. Your parasite management plan should be adjusted accordingly based on regular monitoring.

● Macrocyclic lactones provide prolonged drug exposure that may increase selection pressure for resistant parasites. This effect may be more pronounced in extended-release formulations.


CYDECTIN Injectable has been formulated specifically for subcutaneous injection in cattle and should not be given by other routes of administration. Subcutaneous injection can cause transient local tissue reaction that may result in trim loss of edible tissue at slaughter if animals are slaughtered within 35 days after treatment. This product should not be used in other animal species as severe adverse reactions, including fatalities in dogs, may result.

CYDECTIN Injectable is effective against the migrating stage of cattle grubs (Hypoderma larvae). Treatment with CYDECTIN Injectable during the period when grubs are migrating through vital areas may cause undesirable host-parasite reactions. Killing H. lineatum when they are located in peri-esophageal tissues may cause bloat. Killing H. bovis when they are in the vertebral canal may cause staggering or hindlimb paralysis. Cattle should be treated as soon as possible after heel fly (warble fly) season to avoid this potential problem. Cattle treated with CYDECTIN Injectable at the end of fly season can be retreated during the winter without danger of grub-related reactions. Consult your veterinarian for more information regarding these secondary grub reactions and the correct time to treat with CYDECTIN Injectable.

Animal Safety

U.S. tolerance and toxicity studies have demonstrated that CYDECTIN Injectable has an adequate margin of safety for use in cattle 8 weeks of age and older. No toxic signs were seen in growing cattle given up to 5 times the recommended dose. Calves as young as 8 weeks of age showed no toxic signs when treated with up to 3 times the recommended dose while nursing from cows concurrently treated with the recommended dose level of CYDECTIN Injectable. Mild, transient ataxia was noted in growing cattle receiving 10 times the recommended dose and in bulls treated at 4.5 times the recommended dose. In breeding animals (bulls and cows in estrous and during early, mid and late pregnancy), treatment with at least 3 times the recommended dose had no effect on breeding performance.

Signs of toxicity include ataxia, excessive salivation, depression, and mydriasis. These signs usually occur within 12 to 48 hours post-treatment.


Store product at or below 77°F (25°C). Protect from light. Use contents within 12 months of first puncture.


Do not contaminate water by direct application or by improper disposal of drug containers. Dispose of containers in an approved landfill or by incineration.

Package Information

CYDECTIN Injectable is available in 500 mL amber glass bottles.

Bayer HealthCare LLC, Animal Health Division, Shawnee Mission, Kansas 66201

U.S. Patent No. 5,965,603

Bayer, the Bayer Cross and Cydectin are registered trademarks of Bayer.

© 2019 Bayer

Restricted Drug (CA) - Use Only As Directed

Approved by FDA under NADA # 141-220

May, 2019


Regulations for product use are established by country. Information contained on this site pertains only to the United States of America, and is not intended to provide adequate information for product use. Before using or dispensing any product, read and carefully observe the label directions.

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Copyright © 2023 Animalytix LLC. Updated: 2023-02-28