Mastel 10 belongs to a group of medicines called antihistamines. It is used in the treatment of various allergic conditions. It relieves symptoms like itching, swelling and rashes. Mastel 10 should be taken with or without food. The dose may vary depending on what you are taking it for. Take it as it has been prescribed by your doctor. You may need this medicine only on days you have symptoms, or you may need to take it every day to prevent symptoms from happening. If you stop taking it earlier than advised, your symptoms may come back. This medicine is generally very safe. As compared to other similar medications, it is much less likely to make you feel sleepy. But, it may cause some amount of dizziness, so do not drive or do anything that needs attention. Consult your doctor if it persists or worry you. Before taking it, you should tell your doctor if you have any problems with your liver or kidneys or with your heart. Pregnant or breastfeeding women should also consult with their doctor before taking it. Avoid drinking alcohol as it can cause excessive drowsiness with this medicine.