Ingestion of large doses of the active ingredients has been reported to cause the following effects: Gastrointestinal disturbances such as abdominal pain, nausea, vomiting and diarrhoea would be expected to occur with the menthol and squill. The alcohol in this medicine may alter the effects of other medicines. Talk to your doctor or pharmacist if you are taking other medicines Expectorants such as squill and liquorice are thought to work by increasing the volume of fluid produced in the airways. This helps to thin and loosen the mucus in the airways, making it easier to cough up. However, you should avoid using Covonia herbal mucus cough syrup in combination with other cough medicines. In particular don't use it with medicines that suppress a cough, such as dextromethorphan, pholcodine or codeine.

If you’re driving and using machines: This medicine normally works without causing drowsiness, but care should be taken initially as in rare cases drowsiness may occur. If you are affected, do not drive or operate machinery. The medicine can affect your ability to drive as it may make you sleepy or dizzy. Talk to your doctor or pharmacist if you are not sure whether it is safe for you to drive while taking this medicine. Adverse effects on the heart may result from the cardiac glycosides in squill. Toxic doses may cause or aggravate heart failure. Supraventricular or ventricular arrhythmias and defects of conduction are common and may be an early indication of excessive dosage. Read all of this section carefully before you start using Covonia All-in-One. It includes other information which might be especially important for you. Always use this medicine exactly as described or as your doctor or pharmacist has told you.In particular, if you're taking any of the following medicines you should get advice from your pharmacist before taking Covonia herbal mucus cough syrup, because you may be more likely to get side effects from this cough medicine if you are taking one or more of these:

This medicine contains less than 1 mmol sodium (23mg) per dose, which is to say essentially 'sodium-free' If you notice these or any other side effects not included above, stop use and tell your doctor or pharmacist. They will tell you what to do Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that may be associated with Covonia herbal mucus cough syrup. Just because a side effect is stated here doesn't mean that all people using this cough medicine will experience that or any side effect.Common symptoms of digoxin overdosage include headache, facial pain, fatigue, weakness, dizziness, drowsiness, disorientation, mental confusion, bad dreams and more rarely delirium, acute psychoses, and hallucinations. Convulsions have been reported. Visual disturbances including blurred vision may occur. Colour vision may be affected with objects appearing yellow or less frequently green, red, brown, blue or white. Low blood potassium levels within the body. Unbalanced potassium and sodium levels may produce side effects of muscle weakness, confusion, disorientation, and irregular heartbeat If symptoms get worse, if you get a fever, shortness of breath or blood in your saliva, or if symptoms persist for more than 7 days, consult a doctor or qualified healthcare professional. Liquorice can cause sodium and water retention in the body and a reduced level of potassium in the blood, though this is unlikely to occur with normal doses of this cough medicine.