Adverse effects due to BEROCCA Effervescent tablet intake are very rare. You may occasionally notice a slight yellow discolouration of your urine after taking BEROCCA Effervescent tablet. This effect is completely normal, harmless and is due to the vitamin B2 (riboflavin) contained in the preparation. Allergic reactions, described as uticaria, rash and throat swelling have been reported in isolated cases. If the patient notice any side effects not mentioned in this leaflet, please inform the doctor or pharmacist.