I6 WHITE PILL – IDENTIFICATION, DOSAGE, SIDE EFFECTS

A white pill imprinted with “I 6” (or “I6”) most commonly identifies one of two prescription medications, depending on its physical shape:

• Ibuprofen 600 mg – White, capsule-shaped / oblong tablet imprinted with I6.
• Losartan Potassium 50 mg – White, oval tablet imprinted with I 6.

Because two distinct and potent prescription medications share very similar markings, this guide details both drugs.

Pill Identification & Visual Verification

Marking Active Ingredient & Strength Drug Class Physical Shape

• I6 Ibuprofen 600 mg NSAID (Pain & Inflammation) Capsule-shaped / Oblong
• I 6 Losartan Potassium 50 mg ARB (Blood Pressure) Oval

• Verification Notice: Because both drugs are white and bear an “I 6” or “I6” marking, check the physical shape carefully. If you are ever unsure which medication you have, ask a pharmacist to inspect the tablet before taking it.A

Primary Identification Option A: Ibuprofen 600 mg

Overview & Mechanism of Action

Prescription-strength Ibuprofen (600 mg) is a nonsteroidal anti-inflammatory drug (NSAID). It works by inhibiting cyclooxygenase (COX-1 and COX-2) enzymes. This stops the conversion of arachidonic acid into prostaglandins the primary chemical messengers responsible for triggering pain, fever, and localized tissue swelling.

Uses & Dosing

• Indications: Management of mild-to-moderate pain, osteoarthritis, rheumatoid arthritis, dysmenorrhea (menstrual cramps), and acute inflammatory injury.
• Adult Dosage: Typically 600 mg every 4 to 6 hours as needed, taken with a full glass of water.
• Maximum Daily Cap: Maximum 3,200 mg per day under medical supervision.
• Administration Tip: Take with food, milk, or an antacid to reduce potential stomach distress.

Side Effects

• Common: Nausea, indigestion, abdominal cramps, heartburn, mild dizziness, and diarrhea.
• Serious: Gastrointestinal ulcers, internal bleeding (black/tarry stools, bloody vomit), fluid retention, kidney impairment, and severe allergic reactions.

Boxed Warnings & Precautions

• Cardiovascular Risk: NSAIDs cause an increased risk of serious cardiovascular thrombotic events, including heart attack and stroke. It is contraindicated for peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery.
• Gastrointestinal Risk: Elevated risk of severe stomach bleeding, ulceration, and intestinal perforation, particularly in elderly patients.
• Pregnancy: Avoid taking ibuprofen at 20 weeks of pregnancy or later, as it can cause fetal kidney or cardiovascular complications.

Primary Identification Option B: Losartan Potassium 50 mg

Overview & Mechanism of Action

Losartan Potassium is an Angiotensin II Receptor Blocker (ARB). It functions by selectively blocking the binding of angiotensin II (a potent chemical that causes blood vessels to constrict and narrow) to the receptor. By inhibiting this interaction, losartan relaxes and dilates blood vessels, allowing blood to flow more freely and lowering overall systemic blood pressure.

Uses & Dosing

• Indications: Treatment of hypertension (high blood pressure), reduction of stroke risk in hypertensive patients with left ventricular hypertrophy, and protection against diabetic nephropathy (kidney disease) in type 2 diabetic patients.
• Adult Dosage: Standard starting dose is 50 mg once daily, which may be titrated up to 100 mg daily based on blood pressure response.

Side Effects

• Common: Dizziness, fatigue, nasal congestion, back pain, or mild diarrhea.
• Serious: Severe hypotension (excessively low blood pressure), hyperkalemia (abnormally high blood potassium levels), impaired renal function, and angioedema (swelling of the face, throat, or tongue).

Boxed Warnings & Precautions

• Fetal Toxicity: Do not use during pregnancy. Drugs that act directly on the renin-angiotensin system can cause injury or death to the developing fetus if taken during the second and third trimesters.
• Potassium Monitoring: Because ARBs can increase serum potassium levels, patients should avoid taking potassium supplements or salt substitutes without consulting a physician.

Key Drug Interactions

• Ibuprofen 600 mg Interacts With: Blood thinners (Warfarin, Aspirin), other NSAIDs, ACE inhibitors, ARBs (like Losartan), and diuretics.
• Losartan 50 mg Interacts With: Potassium-sparing diuretics, potassium supplements, lithium, and NSAIDs (like Ibuprofen, which can reduce Losartan’s antihypertensive efficiency and increase kidney strain).