It is contraindicated in patients with known hypersensitivity to the drug.It is highly advised to always consult your doctor before consuming Ventolin tablet. You should always tell your medical history or if you have any allergies from similar drugs like metaproterenol, terbutaline and levalbuterol.Ventolin tablets contain some inactive ingredients that can cause severe allergic reactions if you do not take proper precautions before using this drug. Do not use this tablet without the prescription of the doctor nor recommend it to anyone for your own. Always tell your doctor beforehand if you have any heart problems such as irregular heartbeats, high blood pressure or diabetes. Women should not take this medication during pregnancy and breastfeeding; otherwise, it may prove harmful.