Alcohol: It is unsafe to consume alcohol with Mefzec Syrup. Pregnancy: Mefzec Syrup may be unsafe to use during pregnancy. Although there are limited studies in humans, animal studies have shown harmful effects on the developing baby. Your doctor will weigh the benefits and any potential risks before prescribing it to you. Please consult your doctor. Breastfeeding: Mefzec Syrup is safe to use during breastfeeding. Human studies suggest that the drug does not pass into the breastmilk in a significant amount and is not harmful to the baby. Driving: Mefzec Syrup may decrease alertness, affect your vision or make you feel sleepy and dizzy. Do not drive if these symptoms occur. Kidney: Mefzec Syrup should be used with caution in patients with kidney disease. Dose adjustment of Mefzec Syrup may be needed. Please consult your doctor.Use of Mefzec Syrup is not recommended in patients with severe kidney disease. Liver: Mefzec Syrup should be used with caution in patients with liver disease. Dose adjustment of Mefzec Syrup may be needed. Please consult your doctor.However, the use of Mefzec Syrup is not recommended in patients with severe liver disease and active liver disease.