Levolin (levosalbutamol) is mainly a reliever medicine used when there is a cough or wheezing, and it works quickly to open the airways, so it is often used even in patients who are trying for pregnancy or undergoing fertility treatment. In terms of long-term safety, doctors usually prefer inhaled asthma medicines rather than tablets because inhalers act directly in the lungs and have less overall effect on the rest of the body. Inhaled corticosteroids like budesonide are commonly considered safer and more stable options for long-term control of wheezing or asthma, especially during fertility planning, because keeping breathing well controlled is actually more important than avoiding treatment. If symptoms are frequent, a combination inhaler with a controller medicine may be advised instead of relying only on reliever tablets. The exact choice depends on how severe your wheezing is, how often it happens, and your lung status, so it should be tailored individually. Since you are already in fertility treatment, it is best to avoid changing medicines and get a proper review so your breathing remains stable without affecting your treatment plan or safety.