2 Medication Classes and Common Drugs

Classes, uses, forms, and routes

A drug’s class identifies its pharmacologic group, while its indication is the condition it is used to treat. A medicine may have more than one indication or dosage form. Brand names and available products can vary, so the examples below are representative rather than exhaustive.

A dosage form is the physical preparation, such as a tablet, capsule, oral solution, suspension, cream, inhaler, or injection. A route describes how the medicine enters or is applied to the body. Routes include oral, topical, inhaled, ophthalmic (eye), otic (ear), rectal, intramuscular, and subcutaneous.

Cardiovascular and diabetes medicines

These medicines are used for cardiovascular conditions, cholesterol management, diabetes, and blood clot prevention or treatment.

• Calcium channel blocker: Amlodipine (Norvasc) is used for high blood pressure and angina. It is available as a tablet, oral solution, or suspension. It may cause dizziness or swelling; check product-specific instructions and relevant interactions.

• Statin (HMG-CoA reductase inhibitor): Atorvastatin (Lipitor) lowers cholesterol and helps reduce cardiovascular risk. It is available as a tablet or oral suspension. Unexplained muscle pain or weakness should be reported for pharmacist review; check for interaction concerns and liver-related precautions.

• Biguanide antidiabetic: Metformin (Glucophage) is used for type 2 diabetes and is available as immediate-release or extended-release tablets and oral solution. Kidney function and rare lactic acidosis are important safety considerations. Do not crush or split an extended-release product unless its labeling allows it.

• Long-acting insulin: Insulin glargine (Lantus, Basaglar, Toujeo) is used for diabetes. It is a solution administered by subcutaneous injection, commonly from a vial or pen. This is a high-alert medication: confirm the exact insulin, concentration, device, and directions. Hypoglycemia is a major risk; do not substitute or change insulin without authorization.

• Anticoagulant: Warfarin (Coumadin) and apixaban (Eliquis) are used to prevent or treat blood clots and are available as oral tablets. Bleeding is a risk. Warfarin dosing is adjusted using blood tests and is affected by many medicines and dietary changes. Do not stop or change anticoagulants without prescriber direction.

Infection and breathing medicines

These examples include a medicine for certain bacterial infections and a medicine for bronchospasm.

• Penicillin antibiotic: Amoxicillin (Amoxil) treats certain bacterial infections and is available as a capsule, tablet, chewable tablet, or oral suspension. Check for a penicillin allergy. Antibiotics do not treat viral infections such as colds or flu; prescription directions and duration matter.

• Short-acting bronchodilator: Albuterol (Ventolin HFA; brand examples vary) provides quick relief of bronchospasm. Forms include a metered-dose inhaler, dry-powder inhaler, or nebulizer solution. Confirm the prescribed device and route. Overuse or worsening breathing symptoms warrant pharmacist or prescriber attention.

Digestive, mental health, and thyroid medicines

These medicines are used for stomach acid conditions, depression or certain anxiety-related disorders, and hypothyroidism.

• Proton-pump inhibitor (PPI): Omeprazole (Prilosec) reduces stomach acid. Forms include a delayed-release capsule or granules for oral suspension, with other forms depending on the product. Delayed-release products have special handling instructions; verify whether the specific product may be opened, crushed, or given through a feeding tube.

• Selective serotonin reuptake inhibitor (SSRI): Sertraline (Zoloft) is used for depression and certain anxiety-related disorders and is available as a tablet or oral concentrate. Check for interacting medicines. The concentrate requires product-specific preparation, and abrupt stopping may cause symptoms.

• Thyroid hormone replacement: Levothyroxine (Synthroid) is used for hypothyroidism and is primarily available as an oral tablet or capsule. It is usually taken consistently on an empty stomach. Calcium and iron can interfere with absorption; handle brand or formulation changes according to the prescription and pharmacy policy.

Pain, fever, and acid-related medicines

These medicines are used for pain, fever, inflammation, heartburn, reflux, and some ulcer conditions.

• Analgesic/antipyretic: Acetaminophen (Tylenol) is used for pain and fever. Forms include oral tablets, capsules, and liquids, as well as some rectal products. Too much can seriously damage the liver. Check combination products for duplicate acetaminophen, which may also be labeled APAP.

• NSAID (nonsteroidal anti-inflammatory drug): Ibuprofen (Advil, Motrin) is used for pain, fever, and inflammation. It is available as oral tablets, capsules, or liquid. It can increase gastrointestinal bleeding and cardiovascular risks. Review concurrent anticoagulants, aspirin, or other NSAIDs for pharmacist attention.

• Histamine-2 (H2) blocker: Famotidine (Pepcid) is used for heartburn, reflux, and some ulcer conditions. Forms include an oral tablet, chewable tablet, or suspension. Check product directions and other medicines; dose adjustments may be needed for some patients.

Verify the exact product

The same drug name may be sold in different strengths, dosage forms, and routes. These details must match the prescription and selected product. Product labeling identifies the drug’s name, dosage form, strength, route, directions, and warnings as key product information.

When processing a prescription, compare the generic or brand name, strength, dosage form, route, and release type, such as immediate-release versus extended-release. Do not treat products as interchangeable based on a similar name alone. FDA-approved generic medicines must meet standards for the same active ingredient, strength, dosage form, and route as the brand counterpart, but the dispensed product still must match the order and applicable substitution rules.

Recognize risks and refer concerns

Refer uncertainties to the pharmacist rather than changing a prescription or counseling independently. Examples include an unclear route, an unusual dose, a suspected allergy, a duplicate ingredient, or a possible interaction. Product-specific labeling is the appropriate reference for exact directions and precautions.

Recognize class-specific risks, including bleeding with anticoagulants, hypoglycemia with insulin, allergy with penicillins, and liver injury from excess acetaminophen. Do not stop or change anticoagulants, substitute or change insulin, or alter a prescription without the required authorization or direction.

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