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Benemid

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Benemid (probenecid) is a uricosuric agent used to treat chronic gout and gouty arthritis. It works by helping the kidneys eliminate uric acid from the body, thereby reducing the levels of uric acid in the blood. Benemid helps prevent the formation of painful crystals in the joints for long-term comfort.


Ingredient
Category
Availability
In Stock
Delivery Time
Airmail (14-21 days) | EMS trackable (5-9 days)
Product is shipped in a fully discreet envelope with no content disclosure, including all required documentation inside

Product Sheet

Active Ingredient(s)
Probenecid
Reference Brand
Probenecid
Product Form
Tablet
Regulatory Classification
Rx
Primary Category
Gout Management
Product Category
Musculo-skeletal system, Antigout preparations, Preparations increasing uric acid excretion
Pharmacological Class
Uricosuric agent
Manufacturer Description
Helps prevent gout attacks by removing excess uric acid from the body via the kidneys.
Mechanism of Action
Probenecid increases the excretion of uric acid in the urine by preventing its reabsorption in the kidneys. This lowers the level of uric acid in the blood, preventing the formation of crystals that cause gout.
Route of Administration
Oral
Onset Time
Several weeks to reduce gout frequency
Duration
6-12 hours
Contraindications
History of uric acid kidney stones, Acute gout attack, Blood dyscrasias, Children under 2 years
Severe Adverse Events
Nephrotic syndrome, Severe allergic reaction, Liver necrosis, Aplastic anaemia
Common Side Effects
Loss of appetite, Nausea, Headache
Uncommon Side Effects
Flushing, Vomiting, Dizziness, Sore gums
Drug Interactions
Aspirin (blocks probenecid's effect), Methotrexate, Penicillin antibiotics, NSAIDs
Pregnancy Safety Warnings
Use with caution; consult a doctor.
Age Restrictions
Not for children under 2
Storage Guidelines
Store in a dry place below 30°C
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Benemid FAQ

Can Benemid be used for conditions other than gout?

Benemid’s primary approved use is for gout and for preventing hyperuricaemia during chemotherapy. Some clinicians employ it off-label to increase plasma levels of certain antibiotics, but such use requires careful monitoring and specialist guidance.

How long does it take for Benemid to lower uric-acid levels?

Blood uric-acid concentrations usually begin to fall within a few days of starting therapy, with the full effect observed after several weeks of consistent dosing.

What should I do if I develop a rash while taking Benemid?

A rash may indicate a mild allergic reaction. Stop the medication and contact a healthcare professional promptly; severe reactions require immediate medical attention.

Is it safe to take Benemid while traveling internationally?

Yes, but keep the medication in its original packaging with a copy of the prescription. Some countries may require a doctor’s note for controlled medicines; carrying the MHRA-approved label can help avoid customs issues.

Do I need to avoid any foods while on Benemid?

While Benemid does not directly interact with foods, patients with gout are advised to limit high-purine foods (e.g., red meat, organ meats, certain seafood) and reduce alcohol intake to optimise uric-acid control.

Can Benemid affect blood-test results for drug screening?

Probenecid is not typically screened for in standard occupational or sports drug tests. However, because it can raise levels of certain antibiotics and antivirals, inform the testing authority of any concurrent medications.

What imprint or appearance identifies genuine Benemid pills?

Authentic Benemid tablets are white, round, 500 mg, and bear the imprint “BENEMID 500”. Verify the pill with a pharmacist if you have any doubts about authenticity.

How does Benemid compare with allopurinol for gout management?

Allopurinol reduces uric-acid production, whereas Benemid increases uric-acid excretion. The choice depends on individual renal function, tolerance, and response; many patients may use both under specialist supervision.

Are there any price-control or patent considerations for Benemid in the UK?

Benemid is available as a branded product and also as generic probenecid tablets. After the original patent expiry, generic versions are typically less expensive; pricing is regulated by the NHS drug tariff.

Adequate hydration is essential to prevent uric-acid kidney stones. Aim for at least 2-3 liters of water daily, unless contraindicated by a medical condition such as heart failure.

What is Benemid?

Benemid is a brand-name medication that contains probenecid as its active ingredient. Probenecid belongs to the uricosuric class of agents and is primarily used to increase the excretion of uric acid in the treatment of gout-related pain. In the United Kingdom, Benemid is a prescription-only medicine (POM) regulated by the Medicines and Healthcare products Regulatory Agency (MHRA). It is supplied as a 500 mg pill and is taken orally.

How Benemid Works in the Body

Probenecid works by inhibiting the re-absorption of uric acid in the renal tubules. Normally, uric acid filtered by the kidneys is largely reclaimed back into the bloodstream. By blocking the transport proteins responsible for this reclamation, probenecid raises the amount of uric acid eliminated in the urine, thereby lowering blood uric acid levels. Reduced uric acid helps prevent crystal formation in joints, which is the main cause of gout pain.

Key points of the pharmacology:

  • Target: Renal tubular urate transporters (URAT1 and GLUT9).
  • Onset: Blood uric-acid reduction can be seen within a few days of starting therapy.
  • Duration: The effect persists as long as the drug is taken; steady-state levels are typically reached after several days.
  • Metabolism: Minimal hepatic metabolism; the drug is largely excreted unchanged in the urine.

Conditions Treated by Benemid

Benemid is approved in the UK for the management of gout and for the prevention of hyperuricaemia in patients receiving chemotherapy that can raise uric-acid levels. By lowering uric acid, it reduces the frequency and severity of gout attacks, providing pain-relief benefits as part of a broader gout management plan.

Patient Suitability and Contraindications

Who Should Use Benemid?

  • Adults with a confirmed diagnosis of gout who require additional uric-acid lowering beyond first-line therapies.
  • Patients undergoing chemotherapy who are at risk of tumour lysis syndrome-related hyperuricaemia, when a uricosuric approach is appropriate.

Absolute Contraindications

  • Known hypersensitivity to probenecid or any excipients in the pill.
  • Severe renal impairment (creatinine clearance < 10 mL/min) because the drug relies on renal excretion.
  • History of kidney stones formed from uric acid, as increased urinary uric acid can promote stone formation.

Relative Contraindications

  • Moderate renal impairment (creatinine clearance 10-30 mL/min); dose adjustment and close monitoring are required.
  • Hepatic dysfunction, because liver disease can alter drug handling.
  • Pregnancy (Category B3 in the UK) - use only if the benefit outweighs risk.
  • Lactation - probenecid passes into breast milk; weigh infant exposure against maternal need.

Special Populations

  • Elderly: Reduced renal function is common; start at the lowest effective dose and monitor kidney function.
  • Pediatric: Probenecid is not routinely used in children for gout; safety data are limited.

Safety Profile: Side Effects and Interactions

Common Side Effects

  • Gastro-intestinal upset - nausea, abdominal discomfort reported in many patients.
  • Headache - mild and transient.
  • Rash or mild skin irritation - may indicate a mild hypersensitivity reaction.

Serious Adverse Events

  • Acute kidney injury - especially if fluid intake is insufficient; watch for sudden decrease in urine output.
  • Severe hypersensitivity reactions - including Stevens-Johnson syndrome; seek immediate medical attention.
  • Uric-acid kidney stones - patients should maintain high fluid intake to dilute urine.

Drug Interactions

  • Penicillins and cephalosporins - probenecid reduces renal clearance, raising antibiotic levels; dose adjustments may be needed.
  • Methotrexate - decreased elimination can lead to toxicity; monitor blood counts and liver function.
  • Sulfonamides - competition for renal tubular transport may alter levels of either drug.
  • Warfarin - occasional reports of altered INR; monitor coagulation parameters when therapy is combined.

Food and Lifestyle Interactions

  • Alcohol - can raise uric acid and increase gout risk; limit intake while on Benemid.
  • High-purine foods (e.g., red meat, seafood) - continue dietary modifications to optimise uric-acid control.
  • Driving and machinery - Benemid does not typically impair cognition, but severe side effects (e.g., dizziness) may affect safety; use caution until tolerance is known.

How to Take Benemid

  • Standard dosing: The usual adult dose is 500 mg taken twice daily (morning and evening). The exact regimen should be set by a prescriber based on uric-acid levels, kidney function and concomitant medications.
  • Renal adjustment: For moderate renal impairment, the prescribing clinician may reduce the dose or increase the interval between doses.
  • Administration: Swallow each pill whole with a full glass of water. The tablet can be taken with or without food; however, taking it with food may reduce stomach upset.
  • Missed dose: If a dose is missed and it is less than 12 hours until the next scheduled dose, take the missed dose. Do not double-dose to catch up.
  • Overdose: Symptoms may include nausea, vomiting, dizziness, and excessive urination. Seek emergency medical care; supportive care and monitoring of kidney function are the mainstays of treatment.
  • Discontinuation: Abrupt stopping may cause a rebound rise in uric acid. A prescriber may advise a taper or transition to an alternative gout medication.

Monitoring and Follow-Up

  • Uric-acid levels: Check serum uric acid 2-4 weeks after initiating therapy, then periodically (every 3-6 months) to ensure target levels (< 300 µmol/L for men, < 360 µmol/L for women).
  • Renal function: Serum creatinine and estimated glomerular filtration rate (eGFR) should be measured before starting treatment and at regular intervals (every 6-12 months).
  • Liver enzymes: Periodic liver function tests are advisable, especially if the patient has pre-existing hepatic disease.
  • Signs of kidney stones: Encourage patients to report any flank pain or blood in urine promptly.

Storage and Handling

  • Store Benemid tablets at room temperature (15-25 °C), away from moisture and direct sunlight.
  • Keep the container tightly closed to protect from humidity.
  • Do not use the medication after the expiry date printed on the package.
  • Dispose of unused tablets via a pharmacy take-back program or according to local waste-disposal guidelines; keep out of reach of children.

Medication-Specific Glossary

Uricosuric
A drug that promotes the excretion of uric acid in the urine, thereby lowering blood uric-acid concentrations.
Renal tubular secretion
The process by which the kidneys actively transport substances from the bloodstream into the urine; probenecid targets this pathway to increase uric-acid clearance.
Hyperuricaemia
An elevated level of uric acid in the blood, which can precipitate gout attacks and kidney stone formation.

Medical Disclaimer

This article provides educational information about Benemid and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.

Information for Benemid is sourced from established medical standards and updated frequently. It is provided for general guidance and should be confirmed with a healthcare professional before use.
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