Side effects should only be experienced if you consume far more than a microdose of psilocybin. Even then, the side effects will be minor and non-threatening.
While a microdose should trigger feelings of positivity, taking too much may cause feelings of discomfort, such as:
- Increased anxiety
- Worsened mood
- Cognitive impairment
- Temporary drug-induced psychosis
These occurrences are extremely rare, and even so, should not be severe or last more than a few hours.