Betahistine and prochlorperazine work differently. Betahistine, which helps manage inner ear fluid balance, needs to be taken regularly as prescribed to build up in your system and prevent episodes; it should not be taken on an as-needed (SOS) basis. Conversely, prochlorperazine, which targets acute nausea and severe spinning sensations, can be taken on an SOS basis for temporary relief during sudden flare-ups. However, avoid frequent SOS use without consulting your doctor, as it can cause drowsiness. Please follow your doctor's specific prescription plan for the best recovery.