Zyloric 100mg (Allopurinol) 100 tablets in Kenya

ZYLORIC 100MG, supplied as 100 tablets, contains Allopurinol 100mg as its active ingredient. Zyloric is recognized as the original brand of Allopurinol in Kenya. Allopurinol is a medication primarily used to lower high levels of uric acid in the body, which is crucial for managing conditions like gout, preventing uric acid kidney stones, and mitigating uric acid complications arising from certain cancer treatments.¹ This medication is a prescription-only drug and requires careful medical supervision

Unpacking the Formulation: Key Component and its Mechanism

Allopurinol’s mechanism of action directly targets the metabolic pathway responsible for uric acid production.³

• Allopurinol (100mg):
  • Class: Xanthine Oxidase Inhibitor.⁴

     

  • Mechanism of Action: Allopurinol acts as a structural analogue of hypoxanthine, a natural purine base.⁵ Its primary mechanism involves inhibiting the enzyme xanthine oxidase.⁶ Xanthine oxidase is a critical enzyme in the purine catabolism pathway, responsible for the conversion of hypoxanthine to xanthine, and then xanthine to uric acid.⁷ By inhibiting this enzyme, allopurinol effectively reduces the production of uric acid in the body.⁸ This leads to a decrease in serum (blood) uric acid concentrations, as well as a reduction in the excretion of uric acid in the urine. Consequently, this prevents the formation of uric acid crystals in joints (leading to gout) and kidneys (leading to kidney stones). The 100mg strength is a common starting dose, particularly in patients with kidney impairment, and for gradual titration to achieve target uric acid levels.⁹

Addressing Health Concerns and User Needs

Zyloric (Allopurinol) effectively addresses conditions caused by excessive uric acid, preventing their painful and damaging consequences.

• Gout Management: Prevents painful gout attacks by lowering uric acid levels, which are the primary cause of crystal formation in joints.¹⁰

   

• Hyperuricemia (High Uric Acid): Specifically targets and reduces abnormally high levels of uric acid in the blood, whether from natural production or secondary to other medical treatments.¹¹

   

• Kidney Stone Prevention: Helps prevent the formation of uric acid kidney stones, which can cause severe pain and renal damage.¹²

   

• Complications from Cancer Treatment: Crucial for patients undergoing chemotherapy or radiation, where rapid cell breakdown can release large amounts of purines, leading to dangerously high uric acid levels (tumor lysis syndrome) and potential kidney damage.¹³

   

Identifying Indications for Use

ZYLORIC 100MG (Allopurinol) is a prescription-only medication specifically indicated for the management and prophylaxis of conditions associated with hyperuricemia, including:

• Gout: Chronic management of gout and its complications (e.g., tophi, gouty arthritis).¹⁴ Not for acute gout attacks.

   

• Management of hyperuricemia: High uric acid levels in the blood resulting from various causes, including conditions where there is an increased rate of purine synthesis or breakdown.
• Prevention of uric acid nephropathy: Kidney damage caused by uric acid crystals, particularly in patients undergoing chemotherapy for leukemias, lymphomas, and other malignancies.¹⁵

   

• Prevention of recurrent calcium oxalate kidney stones in patients with hyperuricosuria (excessive uric acid in urine) who have failed dietary modification alone.

Primary Uses

The primary uses of ZYLORIC 100MG include:

• Lowering serum and urinary uric acid levels.¹⁶

   

• Preventing acute gouty attacks (after the initial stabilization phase of treatment).
• Dissolving existing urate kidney stones and preventing new ones.¹⁷

   

• Minimizing the risk of kidney damage due to hyperuricemia in cancer patients.

Understanding Potential Side Effects and Critical Precautions

While Zyloric is essential for managing uric acid, it can cause side effects, and certain precautions are critical.¹⁸

Common Side Effects (Generally Mild and often resolve)

• Rash: Skin rash is the most common side effect. It can be mild (maculopapular) but can sometimes progress to severe forms.
• Nausea, vomiting, diarrhea.¹⁹

   

• Abdominal pain.
• Drowsiness.
• Headache.
• Changes in taste (dysgeusia).²⁰

   

Less Common but More Serious Side Effects (Requiring Immediate Medical Attention)

• Severe Skin Reactions (e.g., Stevens-Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN), Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)): These are rare but life-threatening hypersensitivity reactions to allopurinol, especially in individuals with HLA-B*5801 allele (more common in certain Asian populations) or those with kidney impairment.²¹ Symptoms include severe rash, blistering, fever, swollen glands, mouth sores, difficulty breathing, or yellowing of the skin/eyes. Discontinue allopurinol immediately at the first sign of skin rash and seek urgent medical attention.²²

   

• Liver Problems: Signs include yellowing of the skin or eyes (jaundice), dark urine, persistent nausea/vomiting, severe stomach pain.
• Kidney Problems: Worsening kidney function, blood in urine.
• Bone Marrow Suppression: Low blood cell counts (e.g., leukopenia, thrombocytopenia, aplastic anemia) leading to increased risk of infection, bleeding, or fatigue.
• Acute Gout Attack (Paradoxical worsening at initiation): Allopurinol can sometimes trigger an acute gout attack during the first few months of therapy due to the mobilization of uric acid from tissue stores.²³ Patients are often prescribed prophylactic anti-inflammatory agents (e.g., colchicine or NSAIDs) during initiation.²⁴

   

• Allergic reactions: Swelling of face/lips/tongue/throat, difficulty breathing, dizziness.²⁵

   

Critical Safety Warnings and Precautions for Zyloric (Allopurinol)

ZYLORIC (Allopurinol) is a prescription-only medication.²⁶ Its use MUST be under the strict guidance and supervision of a qualified physician.

• Hypersensitivity Reactions (Skin Rash): This is the most serious concern. Patients must be instructed to discontinue allopurinol immediately at the first appearance of skin rash, regardless of severity, and seek medical attention.²⁷ Rash can be a precursor to severe, life-threatening reactions like SJS or TEN.

   

• Acute Gout Attack: Allopurinol is not for the treatment of acute gout attacks. It should be started only after an acute attack has subsided. Prophylactic anti-inflammatory therapy (e.g., colchicine) is often co-prescribed for the first 3-6 months when initiating allopurinol to prevent treatment-induced flares.²⁸

   

• Kidney Impairment: Dose reduction is usually necessary in patients with kidney impairment to reduce the risk of adverse effects.²⁹ Regular monitoring of kidney function is essential.

   

• Liver Impairment: Use with caution in patients with impaired liver function. Liver function tests should be monitored periodically.
• Dehydration: Adequate fluid intake is crucial during allopurinol therapy to help prevent kidney stone formation and facilitate uric acid excretion.
• Pregnancy and Breastfeeding:
  • Pregnancy: Use during pregnancy only if clearly needed and the potential benefit outweighs the potential risk to the fetus.
  • Breastfeeding: Allopurinol passes into breast milk.³⁰ Use with caution during breastfeeding, and only if benefits justify potential risks.

     

• Drug Interactions: Inform your doctor about all other medications (prescription, over-the-counter, and herbal supplements) you are taking, especially:
  • Azathioprine, Mercaptopurine: Allopurinol significantly increases the levels and toxicity of these immunosuppressants. Their dose must be drastically reduced (often to 25-33% of the usual dose) when co-administered with allopurinol.
  • Warfarin: Allopurinol may enhance the anticoagulant effect of warfarin.³¹ Monitor INR closely.

     

  • Ampicillin/Amoxicillin: Increased risk of skin rash when taken with allopurinol.³²

     

  • Thiazide diuretics: May increase the risk of allopurinol hypersensitivity reactions.³³

     

  • Theophylline: Allopurinol can inhibit the metabolism of theophylline.³⁴

     

  • Cyclosporine: May increase cyclosporine levels.³⁵

     

• Monitoring: Regular monitoring of serum uric acid levels, kidney function, and liver function is often necessary during allopurinol therapy.³⁶

   

Recommended Dosage and Administration Guidelines

The dosage of ZYLORIC 100MG (Allopurinol) is highly individualized based on the patient’s condition, severity of hyperuricemia, and kidney function.³⁷ Always follow your doctor’s precise prescription.

• General Administration:
  • Take the tablet orally, preferably after a meal to minimize gastrointestinal upset.³⁸

     

  • Take each dose with a full glass of water.³⁹

     

  • Ensure adequate fluid intake throughout the day (2-3 liters) to prevent kidney stone formation.⁴⁰

     

• Typical Starting Doses (Adults):
  • For mild gout/hyperuricemia: 100mg once daily.
  • For moderate to severe gout/hyperuricemia: The dose may be started at 100mg once daily and gradually increased by 100mg increments at weekly or bi-weekly intervals until the desired serum uric acid level is achieved.⁴¹

     

  • For prevention of uric acid nephropathy in cancer patients: Higher doses (e.g., 600-800mg/day) may be used, often starting a few days before chemotherapy.
• Maintenance Doses:
  • Typical maintenance doses range from 100mg to 300mg daily.⁴² Doses above 300mg are often divided (e.g., 100mg three times daily).

     

  • Maximum recommended daily dose is generally 800mg, but higher doses are rarely used and only under specialist supervision.⁴³

     

• Dosage in Kidney Impairment: Significantly reduced doses are required in patients with chronic kidney disease.⁴⁴ For example, for creatinine clearance 10-20 mL/min, 100mg daily or less; for CrCl <10 mL/min, 100mg on alternate days or less.

   

• Duration of Treatment:
  • Treatment for gout and chronic hyperuricemia is typically long-term, often lifelong.⁴⁵

     

  • For cancer-related hyperuricemia, it’s used for the duration of chemotherapy.
• Missed Dose: If you miss a dose, take it as soon as you remember, unless it is almost time for your next scheduled dose. Do not double the dose.

Price in Kenya (Approximate)

As of Wednesday, July 2, 2025, the approximate price for ZYLORIC 100MG (ALLOPURINOL 100MG ORIGINAL) – 100 TABS in Kenya can range from Ksh 1,500 to Ksh 2,800 per pack.

Note: Prices can vary significantly between different pharmacies, hospitals, and medical suppliers in Kenya. Factors influencing price include the specific brand (Zyloric is the original brand, generic allopurinol may be cheaper), import costs, pharmacy markups, and any prevailing duties or taxes. It is advisable to check with specific vendors for the most current pricing.

Conclusion

ZYLORIC 100MG (Allopurinol), supplied as 100 tablets, is the original brand in Kenya for effectively managing conditions associated with high uric acid levels, including gout, uric acid kidney stones, and hyperuricemia due to certain cancer treatments. As a xanthine oxidase inhibitor, it works by reducing the body’s production of uric acid.⁴⁶ Zyloric is a prescription-only medication requiring strict medical supervision, especially at initiation, due to the potential for severe hypersensitivity reactions (like serious skin rashes) and the risk of triggering acute gout attacks during the initial phase.⁴⁷ Patients must strictly adhere to the prescribed dosage, ensure adequate hydration, and immediately report any skin rash or unusual symptoms to their doctor for safe and effective long-term management of their condition.