Mpower 5% contains minoxidil and is applied to the scalp, and while most people use it safely, it can rarely cause chest discomfort, fast heartbeat, dizziness or breathing difficulty, especially in people who already have heart or lung problems. Since you already have breathing issues, it is safest to consult a doctor before using this medicine so they can check your condition and advise whether it is suitable for you or suggest an alternative if needed.