In most cases, you can't fatally overdose on THC, whether it's from THC drinks (cannabis beverages), edibles, or other forms of cannabis but having too much can lead to uncomfortable side effects like anxiety, paranoia, dizziness, nausea, and an increased heart rate. These effects can be intense but are mostly temporary. However, any negative side effects are possible with too much of any product and depending on your body makeup could lead to a dangerous outcome.It's important to start with a low dose, especially if you're new to cannabis, and gradually increase your comfort level.