When it comes to identifying pharmaceutical tablets, shape, color, and imprint codes are critical clues. Among the many tablet forms, the B 4 rectangle pill stands out due to its distinct appearance and specific use. This article explores what this pill is, its active ingredients, medical applications, dosage guidelines, and safety considerations.
What Is the B 4 Rectangle Pill?
The B 4 rectangle pill is a white, rectangular-shaped tablet imprinted with the letters “B” and “4” on one side. It is manufactured by Breckenridge Pharmaceutical, Inc. and contains buspirone hydrochloride 15 mg. Buspirone is an anxiolytic medication primarily prescribed for the treatment of generalized anxiety disorder (GAD). Unlike benzodiazepines, buspirone does not cause significant sedation or dependence, making it a preferred option for long-term anxiety management.
Medical Uses and Mechanism of Action
Buspirone works by modulating serotonin and dopamine receptors in the brain—specifically acting as a partial agonist at the 5-HT1A receptor. This mechanism helps reduce anxiety without the high risk of addiction associated with other anti-anxiety drugs. The B 4 rectangle pill is typically prescribed for:

- Short-term relief of anxiety symptoms
- Management of generalized anxiety disorder
- Adjunctive therapy in certain mood disorders
It is not intended for immediate relief of acute anxiety but rather for ongoing, daily use under medical supervision.
Dosage and Administration
The standard starting dose for the B 4 rectangle pill is 15 mg taken orally, usually two to three times daily. Your healthcare provider may adjust the dose based on individual response and tolerability. It’s important to take this medication consistently at the same times each day, with or without food, though some patients report better absorption when taken with meals. Never crush or chew the tablet, as it is designed for extended release in the digestive tract.
Side Effects and Precautions
While generally well-tolerated, the B 4 rectangle pill may cause side effects in some individuals. Common reactions include:
- Dizziness or lightheadedness
- Nausea or upset stomach
- Headache or drowsiness
- Restlessness or nervousness
Serious side effects are rare but require immediate medical attention—such as chest pain, irregular heartbeat, or signs of an allergic reaction. Always inform your doctor about other medications you’re taking, especially MAO inhibitors, as dangerous interactions can occur.
Storage and Handling
Store the B 4 rectangle pill at room temperature, away from moisture and direct sunlight. Keep it in its original container and out of reach of children and pets. Do not use the medication past its expiration date, and dispose of unused pills properly through a pharmacy take-back program or as directed by local regulations.
Identifying the Pill Correctly
Because pill imprints can vary slightly between manufacturers, always verify the identity of any medication using reliable sources such as the FDA’s Drugs@FDA database or reputable pill identifier tools. The B 4 rectangle pill should be white, rectangular, and clearly marked “B 4.” If you’re unsure about a medication, consult a pharmacist before taking it.
Final Thoughts
The B 4 rectangle pill serves as an effective tool in managing anxiety disorders when used responsibly under medical guidance. Understanding its composition, proper usage, and potential risks ensures safer treatment outcomes. Always follow your healthcare provider’s instructions and never self-medicate or share prescriptions.