Why does my urine turn yellow after taking vitamins?

Generally, yellow urine after taking vitamins may be caused by vitamin B2 metabolism, excessive dosage, dehydration, urethritis, cystitis, or other factors. It is recommended to seek timely medical attention to identify the cause and improve the condition through medication adjustment, lifestyle care, and medical treatment under a doctor's guidance. Detailed explanations are as follows:

1. Vitamin B2 Metabolism: Vitamin B2 itself is yellow; parts that are not fully absorbed are excreted through urine, causing yellow urine. No special treatment is required. Continue taking the medication as directed by your doctor, increase daily water intake to 1500-2000 milliliters to help excrete metabolic products, and the urine color will gradually lighten.

2. Excessive Dosage: Self-increasing the dosage of vitamins beyond the body's absorption capacity causes excess vitamins to be excreted in the urine, resulting in yellow urine. Immediately adjust the dosage according to instructions or medical advice, avoid overdosing. Usually, the yellow urine symptom will ease within 1-2 days. Subsequently, strictly control the daily dosage.

3. Dehydration: Drinking insufficient water during vitamin intake or excessive fluid loss due to sweating or diarrhea leads to concentrated urine and increased concentration of vitamin metabolites, worsening yellow urine, accompanied by dry mouth and reduced urine output. Immediately adjust drinking habits, sip water in small amounts frequently, maintain daily water intake at 1500-2000 milliliters, and avoid strenuous exercise to reduce sweating.

4. Urethritis: Bacterial infection causing inflammation of the urethra, with inflammatory irritation leading to congestion of the urethral mucosa, possibly accompanied by yellow urine, frequent urination, urgency, and pain during urination. Patients should follow medical advice to use anti-infective medications such as Levofloxacin Hydrochloride Capsules, Cefuroxime Axetil Tablets, or Azithromycin Capsules.

5. Cystitis: Infection of the bladder by bacteria or mycoplasma damages the bladder mucosa due to inflammation, possibly causing yellow urine, accompanied by lower abdominal pain and cloudy urine. Patients should follow medical advice to use medications such as Cefixime Dispersible Tablets, Ciprofloxacin Hydrochloride Tablets, or Nitrofurantoin Enteric-coated Tablets for treatment.

Maintain a light diet daily, avoid alcohol consumption and medications harmful to the liver and kidneys. Strictly follow medical instructions when taking vitamins—do not increase dosage or take them long-term independently. Monitor changes in urine color, maintain regular rest patterns, and protect urinary system health through comprehensive care.