Yes, Modalert 200 Australia (modafinil) can cause excessive sweating as a potential side effect. This occurs because modafinil stimulates the central nervous system, which can increase heart rate, elevate body temperature, and activate sweat glands. While sweating may be mild for some, others could experience it more intensely, particularly during physical activity or in warm environments. If sweating becomes bothersome or is accompanied by other symptoms like fever or rapid heartbeat, it’s important to consult a healthcare provider.