CCMA · Foundational Knowledge and Basic Science · 7 min read
Medication Forms, Routes, References and Conversions
- Identify common medication forms, delivery systems, and appropriate routes of administration used in the outpatient clinic.
- Explain regulatory standards, drug references, controlled substance schedules, and safety protocols that prevent medication errors.
- Apply metric system conversions and proper dosage documentation practices when preparing delegated medications or relaying provider instructions.
Medication Dosage Forms and Non-Parenteral Delivery Routes
In the outpatient medical office, medications are prepared in various physical forms to achieve specific therapeutic outcomes. The oral route is generally the safest, most convenient, and most economical route of medication administration. Oral solid dosage forms include tablets and capsules, but clinical medical assistants must recognize that not all solid medications can be altered. Enteric-coated tablets must not be crushed or chewed because their coating is designed to resist gastric acid and dissolve in the small intestine. Similarly, healthcare team members must not crush or chew extended-release, sustained-release, or controlled-release medications because doing so can release the drug too quickly into the patient's system. Medical assistants should follow product-specific instructions about splitting tablets or opening capsules when preparing delegated doses.
Oral liquid medications provide flexible dosing options and are categorized by how the active drug is dispersed in the liquid base. Solutions are liquid preparations in which the drug is completely dissolved in a solvent. In contrast, suspensions are liquid medications containing undissolved drug particles that settle over time and must be shaken thoroughly before administration to ensure an even, accurate dose. An elixir is a clear, sweetened liquid medication that contains water, alcohol, and flavoring. When patients take liquid medications at home, the medical assistant, working under the provider's direction, can remind patients to use a calibrated oral syringe or medicine cup rather than a household spoon to measure liquid medication accurately.
Mucosal and topical formulations deliver medications locally or systemically without swallowing. Sublingual medications are placed under the tongue to dissolve and be absorbed through the oral mucosa, whereas buccal medications are placed between the cheek and the gums until fully dissolved. Transdermal patches deliver medication slowly through the skin into the systemic circulation over a prolonged period. Conversely, topical medications, such as creams and ointments, are applied directly to the skin primarily for local therapeutic effects. Suppositories are solid dosage forms designed to melt or dissolve when inserted into the rectum or vagina. For respiratory therapy, metered-dose inhalers deliver a measured amount of aerosolized medication into the lungs.
Common mistakes
- Crushing or chewing enteric-coated, extended-release, sustained-release, or controlled-release tablets, which destroys acid-resistant barriers or risks releasing the drug too quickly.
- Pulling the pinna in the wrong direction for ear drop administration, such as pulling downward and backward on an adult instead of reserving that technique for children younger than 3 years.
- Adding a trailing zero after a decimal point in whole-number medication orders (such as writing 5.0 mg instead of 5 mg), which risks a catastrophic ten-fold overdose if misread.
- Failing to shake a suspension before drawing up or administering the dose, resulting in incorrect drug particle distribution.
Key points
- Enteric-coated and timed-release (extended, sustained, controlled) medications must not be crushed or chewed, and suspensions must be shaken thoroughly to disperse undissolved particles.
- Intradermal injections require a 10- to 15-degree angle with bevel up to form a wheal or bleb; subcutaneous injections use 45 or 90 degrees; intramuscular injections use 90 degrees, with the vastus lateralis preferred in infants and young toddlers.
- When relaying ear drop instructions, explain that the pinna is pulled upward and backward for adults, and downward and backward for children younger than 3 years.
- Schedule II controlled substances have accepted medical uses but high abuse potential, cannot be refilled, and require a new valid prescription from an authorized prescriber, with limited legal exceptions.
- Clinic medication safety includes label checks against the order and measures to distinguish look-alike, sound-alike drugs; barcode scanning adds a check where the clinic has that system.
- Essential conversions include 1 kg = 2.2 lb (divide lb by 2.2 to find kg), 1 tsp = 5 mL, 1 tbsp = 15 mL, 1 fl oz ≈ 30 mL, 1 g = 1,000 mg, and 1 mg = 1,000 mcg.
- Medication documentation requires leading zeros before decimals for values under one (e.g., 0.5 mL) and strictly forbids trailing zeros after whole numbers (e.g., 5 mg, never 5.0 mg) to prevent overdoses.
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