Oral Medication Administration

What It Is

Oral administration delivers a drug through the mouth to be absorbed through the digestive system into the bloodstream.

Advantages

• Easy to give, often without supervision, which helps compliance.
• Noninvasive, no injection pain or infection risk.
• Many forms: tablets, capsules, liquids, chewables, for different patients.
• Less expensive than injectables or patches.
• Stable at room temperature with a long shelf life.

Disadvantages

• Variable absorption, affected by food, gastric pH, and other drugs.
• GI side effects: nausea, vomiting, diarrhea, stomach irritation.
• First-pass metabolism through the liver lowers bioavailability for some drugs, so they need higher doses.
• Slower onset than IV or IM, a drawback in acute pain or emergencies.
• Not for everyone: severe vomiting, unconsciousness, or dysphagia rule it out.

Forms of Oral Medications

• Tablets. Solid, coated or uncoated, sometimes chewable or dissolvable.
• Capsules. A gelatin or vegetarian shell with powder, liquid, or granules; immediate or controlled release.
• Liquids. Solutions, suspensions, syrups, easier for children and patients who cannot swallow pills. Measure with a medication spoon, cup, or syringe.
• Sublingual and buccal. Sublingual goes under the tongue, buccal between gum and cheek, for rapid absorption through the mucous membranes.

Contraindications

• Dysphagia, risking choking or aspiration into the lungs.
• Severe nausea, vomiting, or gastric obstruction, which block absorption.
• Gastric or nasogastric tubes that interfere with absorption.
• Unconscious or comatose patients who cannot swallow safely.
• Aspiration risk from an impaired gag reflex or altered consciousness.

Administering Oral Medication

General Preparation

1. Wash your hands before handling medication.
2. Verify the order on the medication administration record (MAR): medication, dose, time.
3. Confirm the patient with at least two identifiers (name and date of birth).
4. Explain the purpose and potential side effects.
5. Check contraindications and allergies, and assess swallowing.

Equipment

• MAR
• Medication in its prescribed form (tablets, capsules, liquids)
• Medication cup, spoon, or oral syringe for liquids
• Water and a drinking cup
• Pill crusher or splitter if needed
• Gloves if protocol requires
• Hand hygiene supplies
• Documentation tools

Tablets and Capsules

1. Instruct and supervise; tablets and capsules are usually swallowed whole with water.
2. Position the patient upright to prevent aspiration and ease swallowing.
3. Confirm the full dose is swallowed.
4. Offer a full glass of water so it reaches the stomach and does not lodge in the esophagus.

Liquid Medications

1. Shake suspensions well for an even, accurate dose.
2. Measure with a proper device (spoon, cup, syringe), never a household utensil.
3. Position the patient upright.
4. Make sure the patient takes the entire dose.
5. Offer a little water to rinse it down.

Sublingual and Buccal

1. Place under the tongue (sublingual) or between gum and cheek (buccal).
2. No chewing or swallowing; these dissolve in place for rapid absorption.
3. Watch until it dissolves.
4. No eating, drinking, or smoking until it is fully absorbed.

After Administration

1. Document the administration.
2. Monitor for adverse reactions.
3. Give followup instructions.

Nursing Considerations

1. Do not crush or split tablets unless specified. Extended-release and coated tablets change how the drug releases if crushed, which cuts efficacy or causes dose dumping and toxicity. Check the ISMP Do Not Crush list before altering any oral solid.
2. Do not open capsules unless directed, since delayed-release or enteric coatings protect the stomach and control absorption.
3. Assess swallowing, especially in the elderly; switch to liquids or dissolvable tablets if needed.
4. Check for polypharmacy in older adults to manage interactions and side effects.
5. Use age-appropriate techniques; children often do better with liquids, chewables, or pleasant flavors.
6. Use age-appropriate devices (solid dosage pen, multiparticulate counters, medicated straws) for precise dosing.
7. Dose children by weight and age to ensure efficacy and avoid toxicity.
8. Simplify the regimen for patients with cognitive impairment to improve adherence.
9. Stay until all medication is swallowed before you sign.

Frequently Asked Questions

Why is the oral route used most often? It is convenient, noninvasive, and inexpensive, the dosage forms are stable at room temperature, and patients can often self-administer, which supports adherence.

When is the oral route contraindicated? With dysphagia, severe nausea or vomiting, gastric obstruction, an impaired gag reflex, or an unconscious or comatose patient, because of the risk of choking, aspiration, or failed absorption.

Which tablets should never be crushed? Enteric-coated and extended- or controlled-release tablets. Crushing strips the coating or the slow-release mechanism, causing stomach irritation or dose dumping that can reach toxic levels. The ISMP Do Not Crush list spells out which products are affected.

How should liquid medications be measured? With a calibrated device such as an oral syringe, medication cup, or dosing spoon, never a household teaspoon. Shake suspensions first so the dose is even and accurate.

What is first-pass metabolism? After oral absorption, blood carries the drug through the liver before it reaches the systemic circulation, where some of it is metabolized. This lowers bioavailability, so certain oral drugs need a higher dose than the same drug given intravenously.

What is the difference between sublingual and buccal administration? Sublingual medication goes under the tongue and buccal medication sits between the gum and cheek. Both dissolve in place and absorb through the mucous membranes for rapid effect, so the patient should not chew or swallow them.