Why do some antibiotics notify not to falsehood down for 30 mins after taking them?

Why do some antibiotics notify not to falsehood down for 30 mins after taking them?
Some antibiotics can cause indigestion and reflux. Laying down cause the stomach contents to wash upwards increasing the luck of this happening.
Risk of dizziness
some medication are hard on the stomach to digest. If you lay down, your body's innate reaction is to slow it's processes...including digestion which will make longer the amount of time it takes to obtain the medication into your blood stream.
its to prevent heartburne,so the medcin can easyer slide down into the stomach without burning your throat or induce bitter reflux