Astelong 5mg Oral Suspension belongs to a group of medicines called antihistamines. It used for treating allergic conditions like runny nose, red and watering eyes, or skin rashes. It also treat allergic reactions due to any medicine or food. Astelong 5mg Oral Suspension should be taken on an empty stomach. 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. The most common side effects are dizziness and drowsiness. This is usually mild and goes away after a couple of days as your body adjusts. Consult your doctor if it persists or worries you. Before taking it, you should tell your doctor if you have any problems with your liver or kidneys or with your heart as antihistamines can cause your heart to beat faster. 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. It usually does not impair your ability to drive, but you should not drive if it makes you feel sleepy or dizzy.