If your drink has been spiked it is unlikely it will look, smell, or taste any different. Most drugs take effect within 15-30 minutes and symptoms will usually last for several hours. The effects of spiking vary depending on what you’ve been spiked with. Your symptoms could include:
- Lowered inhibitions
- Loss of balance
- Visual problems
- Confusion
- Nausea
- Vomiting
- Unconsciousness
- Feeling dizzy, faint, or sleepy
Ref. https://www.yourunion.net/support/safety/spiking/