Placebo
This pill is called a placebo. It does not contain any active ingredients, but it may still have a psychological or therapeutic effect on the patient due to the power of suggestion.
If you forgot to take a sugar pill in your birth control pack, it generally does not affect the effectiveness of the birth control. Just continue taking the next pill as scheduled. If you are unsure or have concerns, consult your healthcare provider for further guidance.
The resulting solution is called a sugar solution or sugar water.
If you accidentally take an active pill on a day you were supposed to take a sugar pill in your birth control pack, it is generally safe to continue normally with the rest of the pill pack. However, this may shift your hormone levels slightly, increasing the chance of hormonal side effects like spotting or breakthrough bleeding. It's always best to check with your healthcare provider for personalized advice.
A mixture of sugar and water is best called a solution.