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HLT-VET42-07 · Lesson 6 · 18 clock hours · lab

Oral, Topical, Ophthalmic, and Otic Drug Administration

Objective. Students will demonstrate correct technique for oral tablet/liquid administration, topical and transdermal application, ophthalmic drop/ointment instillation, and otic medication application on animal models and supervised live animals.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

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Oral, Topical, Ophthalmic, and Otic Drug Administration

Administering medications accurately and safely is one of the most fundamental skills in veterinary practice. Each route of administration has its own technique, safety considerations, and documentation requirements. Errors in technique can harm the patient, waste medication, or expose the handler to drug residues. Always verify the patient, the drug, the dose, the route, and the time before administering any medication — this five-point check mirrors the "five rights" used across healthcare.

Oral Medication Administration

Oral medications are given as tablets, capsules, or liquids. Before administering, confirm the patient's weight and calculate the correct dose or volume as ordered. Document the simulated or actual patient weight, drug name, dose, volume or tablet count, route, and time on the treatment sheet immediately after administration — never before.

Tablet and capsule administration in dogs: Position the dog in a sitting or standing position. Use one hand to grasp the muzzle from above, tilting the head slightly back. With the other hand, use the middle finger to gently press the lower incisors downward to open the mouth. Place the tablet as far back on the base of the tongue as possible, close the mouth, and hold it gently while stroking the throat or blowing lightly on the nose to encourage swallowing. Confirm swallowing before releasing the patient.

Pill-gun technique: A pill gun (pilling device) is especially useful for cats or for handlers who wish to keep fingers away from the molars. Load the tablet into the tip, open the mouth as above, advance the tip past the base of the tongue, depress the plunger, and withdraw the device. Follow with a small amount of water via oral syringe to ensure the tablet reaches the esophagus, reducing the risk of esophageal irritation — this step is particularly important in cats.

Liquid oral medications: Draw up the correct volume in an oral dosing syringe. Insert the tip into the cheek pouch (between the cheek and teeth), not directly into the throat. Administer slowly in small amounts, allowing the patient to swallow between increments, to minimize aspiration risk. Never administer liquids rapidly into the back of the throat.

Topical and Transdermal Medications

Topical products include spot-on flea and tick preventives and topical antimicrobials. Transdermal gels (for example, methimazole gel for cats) are absorbed through the skin and deliver systemic drug levels.

PPE is mandatory. Always wear exam gloves when applying any topical product. Read the label before application; many products are species-specific and toxic to other species (for example, permethrin-based products labeled for dogs are toxic to cats). Never apply a product to a species not listed on the label.

Spot-on placement: Part the hair at the base of the skull or between the shoulder blades (follow label directions exactly). Apply the entire contents of the applicator directly to the skin, not the haircoat. Do not rub in. Avoid the patient licking the site. Wash hands after removing gloves.

Transdermal gel application: Use a calibrated dosing syringe. Apply the gel to the inner surface of the ear pinna, rotating sites with each dose to prevent local skin reactions. Document the site used (e.g., left ear, right ear) and the time. Wear gloves to prevent handler absorption of the drug.

Ophthalmic Medication Administration

Ophthalmic medications include drops (solutions) and ointments. They are applied to the conjunctival sac, not directly onto the cornea.

Drops: Gently restrain the patient's head. Use the non-dominant hand to retract the upper eyelid slightly and steady the head. Hold the dropper bottle with the dominant hand approximately 1 cm above the eye. Instill the prescribed number of drops into the conjunctival sac. Do not allow the bottle tip to touch the eye, cornea, or periocular skin — contact contaminates the bottle and risks corneal injury.

Ointments: Pull down the lower eyelid to form a small pocket. Apply a thin ribbon of ointment into the conjunctival sac, again without touching the tube tip to the eye. After application, gently close the eyelids and apply light pressure for a few seconds to distribute the medication.

Signs of patient discomfort that require stopping and notifying the supervising veterinarian include: excessive pawing at the eye, corneal cloudiness, profuse tearing, blepharospasm (squinting), or sudden behavioral changes indicating pain.

Otic Medication Administration

Otic (ear) medications are applied to the external ear canal. Before administration, the ear should be visually inspected; if the eardrum (tympanic membrane) is suspected to be ruptured, notify the veterinarian — certain otic products are contraindicated with a perforated tympanum.

Gently hold the ear pinna upright to straighten the ear canal. Insert the applicator tip into the vertical portion of the canal without forcing it. Instill the prescribed amount, then gently massage the base of the ear canal (the cartilaginous section at the base of the ear) for the time specified — usually 20 to 30 seconds — to distribute the medication into the horizontal canal. Allow the patient to shake its head, then wipe away excess medication and debris from the pinna with a cotton ball. Do not use cotton-tipped applicators deep in the canal.

Signs of discomfort during otic administration include head-shaking, crying, sudden aggression, or extreme resistance. Stop and reassess if these occur.

Documentation

Every administration must be recorded on the treatment sheet: patient ID, drug name, dose ordered, volume or unit administered, route, site (for topical/transdermal/otic), date, time, and the initials of the person who administered the medication. Accurate records protect patients and are a legal requirement in practice.

Key terms8

Conjunctival sacThe space between the inner surface of the eyelid and the surface of the eye where ophthalmic drops and ointments are deposited.
Transdermal gelA medication formulated to be absorbed through the skin, typically applied to the inner ear pinna, delivering drug systemically without oral dosing.
Spot-onA topical liquid preparation applied to a small area of skin, usually at the base of the skull or between the shoulder blades, for systemic or local effect such as flea and tick prevention.
Pill gun (pilling device)A handheld device used to place tablets or capsules at the base of an animal's tongue without placing fingers deep in the mouth.
BlepharospasmInvoluntary, forceful closing or squinting of the eyelids, often a sign of ocular pain or irritation.
Tympanic membraneThe eardrum; a structure separating the external ear canal from the middle ear. Rupture is a contraindication for many otic medications.
Cheek pouchThe space between the cheek and the teeth used as the target site for oral liquid administration to reduce aspiration risk.
Five rights of medication administrationA safety check verifying the right patient, right drug, right dose, right route, and right time before administering any medication.

Worked examples3

1. A dog weighs 22 lb. The veterinarian orders amoxicillin oral suspension at 10 mg/kg. The suspension on hand is 50 mg/mL. How many mL will you draw up in the oral dosing syringe?
  1. Step 1 — Convert weight to kilograms: 22 lb ÷ 2.2 = 10 kg
  2. Step 2 — Calculate the dose in mg: 10 kg × 10 mg/kg = 100 mg
  3. Step 3 — Calculate the volume: 100 mg ÷ 50 mg/mL = 2 mL
Answer: Draw up 2 mL in the oral dosing syringe.
2. A cat weighs 4.5 kg. A transdermal methimazole gel is ordered at 2.5 mg per dose. The gel contains 5 mg/0.1 mL. What volume do you apply to the ear pinna?
  1. Step 1 — Identify the dose ordered: 2.5 mg
  2. Step 2 — Determine the concentration: 5 mg per 0.1 mL
  3. Step 3 — Calculate volume: 2.5 mg ÷ 5 mg per 0.1 mL = 0.5 × 0.1 mL = 0.05 mL
Answer: Apply 0.05 mL of gel to the inner surface of the ear pinna.
3. A dog is prescribed ophthalmic gentamicin solution, 2 drops in the right eye three times daily. During morning treatment you notice the dog is squinting severely and pawing at that eye. What is your correct next action?
  1. Step 1 — Stop the ophthalmic administration immediately; do not instill the drops.
  2. Step 2 — Do not force the eyelid open, as this could worsen injury if corneal damage is present.
  3. Step 3 — Notify the supervising veterinarian at once and describe the signs (blepharospasm, pawing).
  4. Step 4 — Document the signs observed, the time, and that the dose was withheld pending veterinary assessment.
Answer: Stop administration, notify the veterinarian immediately, and document the patient's signs and your actions. Do not administer the drops until the veterinarian re-evaluates the patient.

The math in this lesson2

Learners convert 22 lb to 10 kg, compute 100 mg at 10 mg/kg, and draw 2 mL of 50 mg/mL suspension.
7.RP.2N-Q.1
Brush up in the math halls at newSchoolWorks.com:
In class: Oral pilling and liquid dosing on canine and feline mannequins: students practice the pill-gun technique, the direct-hand pill technique, and use of an oral dosing syringe for liquids, documenting simulated patient weight, dose ordered, volume or tablet count, and time on a treatment sheet · Topical and transdermal application stations: students apply a mock flea/tick topical product using PPE (gloves), demonstrate correct spot-on placement on a mannequin, and simulate application of a transdermal gel to the ear pinna, documenting the site, dose, and time; instructor emphasizes handler safety and label warnings · Ophthalmic and otic stations: students use saline-filled ophthalmic drop bottles and otic solution dispensers on mannequin heads to practice holding the eyelid, instilling drops without touching the cornea, and massaging the ear canal base after otic instillation; students identify signs of patient discomfort that would require stopping
Materials: Canine and feline pill mannequins (or low-fidelity models), pill guns, oral dosing syringes, mock topical flea product (empty applicator for training), transdermal gel training syringe, saline ophthalmic drop bottles, otic solution dispensers with saline, exam gloves, treatment sheet forms, Plumb's Veterinary Drug Handbook
Check: Instructor observation checklist: student must demonstrate all four administration routes in a single 20-minute practical session; each route is graded pass/fail on technique, PPE use, and documentation; all four routes must be passed; one repeat permitted per failed route

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Pharmacology / Patient Care
1. When administering liquid oral medication to a dog, where should the tip of the dosing syringe be directed?
Pharmacology / Toxicology
2. A veterinary assistant is about to apply a permethrin-based spot-on to a patient. Which action is most critical before application?
Patient Care / Nursing Procedures
3. After instilling otic medication into a dog's ear, what should the technician do immediately?
Pharmacology / Aseptic Technique
4. During ophthalmic drop administration, the dropper tip accidentally contacts the patient's cornea. What is the most important immediate concern?
Pharmacology / Pharmaceutical Calculations
5. A cat weighs 3.3 kg. The veterinarian orders an oral liquid medication at 5 mg/kg. The solution is 25 mg/mL. What volume should be administered?
Patient Care / Clinical Judgment
6. Which finding during pre-administration ear inspection should prompt the technician to withhold the otic medication and notify the veterinarian before proceeding?
Pharmacology / Handler Safety
7. Which PPE is required every time a veterinary assistant applies a transdermal gel to a patient's ear pinna?
Pharmacology / Patient Care
8. A veterinary assistant uses a pill gun to medicate a cat. After the plunger is depressed and the device is withdrawn, what is the most appropriate next step?
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