biphasic response

A biphasic response occurs when a substance or treatment causes two opposite reactions at different times. For example, a medication might initially stimulate a response, like increased energy, but later lead to a decrease or suppression of that same response. Think of it as having two phases: first, an activating effect, then a calming or opposite effect. This pattern helps explain some biological and medical reactions, such as how certain drugs or hormones can have complex, time-dependent impacts on the body.