A white, round tablet stamped with the imprint “209” is most commonly Amlodipine Besylate 10 mg. It is one of the most widely prescribed cardiovascular medications belonging to the dihydropyridine calcium channel blocker (CCB) drug class. Amlodipine is primarily indicated for managing high blood pressure (hypertension) and treating chest pain (angina).
Pill Identification
When verifying the identity of a pill imprinted with “209”, check its physical attributes carefully:
Visual Characteristic – Physical Description
- Imprint Code –
209debossed on one side; plain/blank on the reverse - Active Ingredient – Amlodipine Besylate (10 mg)
- Color & Shape – White to off-white, round, flat-faced with beveled edges
- Drug Class – Dihydropyridine Calcium Channel Blocker (CCB)
- Alternative Identifications: Other medications also use a “209” imprint code in different visual configurations:
- Terbinafine Hydrochloride 250 mg: White, round tablet imprinted with
IG 209. - Allopurinol 100 mg: White, round tablet imprinted with
1 209. - Lisdexamfetamine Dimesylate 40 mg: Green and white capsule imprinted with
G 40mg 209.
- Always consult a licensed pharmacist or healthcare provider to confirm the identity of an unknown medication.
Mechanism of Action
Amlodipine works by relaxing the smooth muscles surrounding the blood vessels:
- Inhibition of L-Type Calcium Channels: Amlodipine selectively blocks the influx of calcium ions across cell membranes into vascular smooth muscle cells and cardiac muscle cells.
- Arterial Vasodilation: By inhibiting calcium influx, it prevents smooth muscle contraction. This causes peripheral arteries and coronary arteries to dilate (widen), which significantly decreases total peripheral resistance (afterload).
- Cardiovascular Effects: Dilating peripheral blood vessels lowers systemic blood pressure. Dilating coronary arteries increases oxygen delivery to the heart muscle, relieving and preventing anginal chest pain.
Indications & Dosage
Approved Medical Uses
- Hypertension (High Blood Pressure): Used alone or in combination with other antihypertensive drugs to lower blood pressure, reducing the long-term risk of strokes and heart attacks.
- Coronary Artery Disease (CAD): Helps lower the risk of hospitalization for angina and coronary revascularization procedures.
- Chronic Stable Angina & Vasospastic Angina: Prescribed for symptomatic management of exertional chest pain or Prinzmetal’s (variant) angina.
Typical Dosage Guidelines
- Adult Starting Dosage: Generally 5 mg once daily. For small, fragile, or elderly patients, or those with hepatic insufficiency, treatment may start at 2.5 mg once daily.
- Maximum Daily Dose: 10 mg once daily (one 209 tablet).
- Pediatric Patients (6–17 years): Typically 2.5 mg to 5 mg once daily.
- Administration: May be taken orally once daily, with or without food. Consistency in taking it at roughly the same time each day is recommended.
Side Effects
Because amlodipine works by relaxing blood vessels, its side effects are primarily tied to vasodilation and mild fluid shifts.
Common Side Effects
- Peripheral Edema: Swelling in the lower legs, ankles, or feet (most common at the 10 mg dosage).
- Dizziness or Lightheadedness: Due to the blood-pressure-lowering effect.
- Flushing: A warm, reddened sensation in the face or neck.
- Fatigue or Somnolence: Feeling unusually tired or sleepy.
- Palpitations: A feeling of a rapid or fluttering heartbeat.
- Nausea or Abdominal Pain
Serious Side Effects (Require Prompt Medical Attention)
- Severe Hypotension: Excessively low blood pressure leading to fainting (syncope) or profound dizziness.
- Worsening Angina or Heart Attack: In rare instances, particularly when starting amlodipine or increasing the dose, chest pain may worsen or trigger a myocardial infarction in patients with severe obstructive coronary artery disease.
- Hypersensitivity Reactions: Severe allergic reactions involving swelling of the face, lips, tongue, or throat causing difficulty breathing.
Warnings & Precautions
Key Clinical Warnings
- Risk of Increased Angina / Myocardial Infarction: Rarely, patients with severe obstructive coronary artery disease can develop increased frequency, duration, or severity of chest pain when starting or increasing calcium channel blocker therapy.
- Symptomatic Hypotension: Caution is required in patients with severe aortic stenosis, as the vasodilator effect can cause sudden drops in blood pressure.
Important Precautions
- Hepatic Impairment: Amlodipine is extensively metabolized by the liver. Patients with severe liver disease clear the drug more slowly and require lower starting doses.
- Heart Failure: While amlodipine is generally safe in patients with heart failure (unlike some older calcium channel blockers), it should be used cautiously in conjunction with other cardiovascular agents.
- Pregnancy & Breastfeeding: Amlodipine should be used during pregnancy only if the potential benefit outweighs the risk to the fetus. Small amounts pass into human breast milk; consult a doctor before nursing.
Significant Drug Interactions
- Simvastatin: Amlodipine increases blood levels of simvastatin. Doses of simvastatin should generally be limited to 20 mg daily when co-administered with amlodipine to prevent muscle toxicity (rhabdomyolysis).
- Strong CYP3A4 Inhibitors: Medications such as ketoconazole, itraconazole, or ritonavir can increase amlodipine concentration in the bloodstream, raising the risk of severe side effects.
- Immunosuppressants (e.g., Tacrolimus, Cyclosporine): Amlodipine may raise systemic levels of these medications, requiring close therapeutic drug monitoring.