Ivermectin Paste Dosage Calculator

Calculate safe dosing weight portions of equine ivermectin paste (1.87%) by animal species, target dose requirements, and product specifics.

IMPORTANT MEDICAL & VETERINARY DISCLAIMER

This calculator is designed purely for mathematical representation and educational purposes. It is NOT medical or veterinary advice. Any off-label utilization of equine ivermectin paste (intended for horses) in humans or other non-equine species carries rigorous contamination, incorrect dosing, and neurotoxicity risks.

Always consult a licensed medical clinician or a registered livestock/small-animal veterinarian prior to administering any macrocyclic lactone or anti-parasitic therapeutics. Calculations shown correspond directly to established veterinary and scientific guidelines in peer-reviewed literature.

Calculator Inputs

Specify the species, clinical weight, and product characteristics.

3. Active Paste Product Details

4. Dosage Adjustments && Multi-dose Scaling

Calculated Dosage Results

portioning details derived using standard pharmacological formulas.

Active Ivermectin
90.72mg
Quantity of Paste
4.851grams
Based on 1.87% concentration
Required Notch Portions
3.99notches / max 5
0
1
2
3
4
5
Tube Portion: 79.8%Scale: 0 to 5 marks
Total Logistics summary
Total raw paste needed:4.85 g
Exact decimal tubes:0.80 tubes
Rounded tubes to buy:1 tube

Protocol && Schedule

Preset indication: Horse: General Deworming

Standard FDA-approved dose for control of bots, strongyles, pinworms, and hairworms. Often repeated twice a year based on fecal egg counts.

⏱️ Interval: Every 14 days as needed.

How the Math Works

Underlying mathematical models used to evaluate exact paste weight portioning.

Ivermectin paste contains a specific concentration of active ingredient (usually 1.87%). To compute the precise mass of paste required to deliver a desired mcg/kg dose:

1. Convert weight to kg:

Weight (kg) = Weight (lbs) × 0.45359237

2. Find active ivermectin needed (mg):

Ivermectin (mg) = [Weight (kg) × Dose (mcg/kg)] / 1000

Adjusted with Margin = Ivermectin (mg) × [1 + Safety Margin % / 100]

3. Standardize paste concentration (mg/g):

Mg of Ivermectin per single gram of paste = Concentration % × 10

For 1.87% paste, this equals exactly 18.7 mg of active ingredient per gram.

4. Calculate paste dosage (grams):

Pasta (g) = Adjusted Ivermectin (mg) / Concentration (mg/g)

Clinical Guidance & Protocols

Key parameters regarding deworming frequencies and resistance mitigation.

Dosing Intervals

Dosing frequency is highly variable by species. Traditional blanket treatment is being largely replaced by targeted deworming. For horses, check fecal egg counts (FEC) twice annually (spring/fall) and only treat high shedders to mitigate drug resistance.

Resistance Management

Persistent mass overuse of ivermectin has generated widespread anthelmintic resistance in strongyles (horses), and Cooperia species (cattle). Always rotate drug classes (benzimidazoles, tetrahydropyrimidines) yearly where applicable.

Quick Reference: Standard Clinically Referenced Dosages

Commonly referenced anti-parasitic dosage parameters based on approved veterinary labeling and clinical monographs.

SpeciesRecommended UsageDose (mcg/kg)Clinical Notes & RegimenSources
HorseGeneral Deworming200Standard FDA-approved dose for control of bots, strongyles, pinworms, and hairworms. Often repeated twice a year based on fecal egg counts.[1], [2], [3]
HumanStrongyloides stercoralis200Typically administered as a single oral dose. Repeat in 2 weeks to ensure eradication of newly hatched larvae if clinical symptoms or positive fecal tests persist.[4], [5], [6]
HumanOnchocerciasis150Mass drug administration is typically scheduled every 6 to 12 months to suppress microfilariae production.[4], [5], [7]
HumanScabies Treatment200Given as two doses, typically 7 to 14 days apart. The second dose targets newly hatched mites before they can reproduce.[5], [8], [9]
HumanHead Lice (Pediculosis)200Often prescribed as two doses given 9-10 days apart to kill newly hatched lice.[10], [11]
DogHeartworm Prevention6Extremely ultra-low dose administered monthly as a preventative measure. Eliminates larval tissue stage.[12], [13], [14]
DogDemodectic Mange300Requires daily dosing. Continue treatment for 1-2 months past two consecutive negative skin scrapings.[13], [15], [16]
DogSarcoptic Mange300Administered once every 14 days for 3 to 4 sequential doses.[13], [15], [17]
DogGiardiasis200Used off-label, typically combined with other dewormers like fenbendazole.[13], [18]
CattleGI and Lung Nematodes200Used for gastrointestinal roundworms, lungworms, grubs, sucking lice, and mange mites. Standard oral paste dose (injectable/pour-on often preferred).[2], [19], [20]
GoatGastrointestinal Parasites300Goats have a faster metabolism and hepatic clearance than sheep/cattle, commonly requiring higher doses to achieve clinical efficacy.[2], [21], [22]
SheepNematode Parasites200Used for gastrointestinal worms, lungworms, and nasal bots. Selectively treat using FAMACHA scoring system to prevent resistance.[2], [22], [23]
SwineNematodes and Ectoparasites300Used to control roundworms, kidney worms, lungworms, lice, and mange mites. Standard oral administration dose.[2], [19], [24]

Published Sources & Academic Literature