Clenbuterol is a bronchodilator primarily used for treating asthma and other respiratory conditions. However, it's also been misused in certain circles, particularly in the realm of strength sports and bodybuilding due to its potential effects on fat loss and muscle preservation. While it's important to note that using clenbuterol for performance enhancement is not approved by regulatory bodies and can have serious side effects, some athletes have used it for potential benefits such as:

1. Fat Loss: Clenbuterol can increase the metabolic rate, leading to potential fat loss. It may aid in reducing body fat percentage when combined with a proper diet and exercise regimen.

2. Preservation of Lean Muscle: Some users suggest that clenbuterol helps in preserving lean muscle mass while cutting, which is why it's sometimes sought after in bodybuilding circles during competition preparation.

3. Improved Endurance: There are reports that clenbuterol might enhance cardiovascular efficiency and endurance, allowing athletes to train harder and longer.

However, it's crucial to emphasize that the use of clenbuterol is associated with significant risks and side effects, including but not limited to:

- Cardiovascular Issues: Increased heart rate, palpitations, and elevated blood pressure are common side effects that can pose serious health risks, especially for individuals with underlying cardiovascular conditions.

- Nervous System Effects: Clenbuterol misuse can lead to nervousness, tremors, insomnia, and anxiety.

- Electrolyte Imbalance: Misuse of clenbuterol may cause electrolyte imbalances, particularly potassium depletion, which can result in muscle cramps, dizziness, and in severe cases, cardiac arrhythmias.

As for dosages, clenbuterol usage should always be supervised by a healthcare professional. The dosages vary widely among individuals and should be carefully titrated to assess tolerance and minimize side effects. Typical dosages used by some athletes might range from 20mcg to 120mcg per day, often cycled in patterns (e.g., two weeks on, two weeks off) to mitigate tolerance and reduce side effects. However, these dosages can be extremely risky and are not endorsed or recommended due to the potential health hazards.

It's essential to highlight that clenbuterol is banned by most sports organizations and regulatory bodies due to its performance-enhancing effects and potential health risks. Athletes found using clenbuterol in competitions can face severe penalties, including disqualification, suspension, and damage to their reputation. Health should always come first, and exploring legal and safe methods of improving athletic performance is highly encouraged.