I use Traditional Medicinals Mother's Milk tea, but it should be similar and does have directions. It says to steep one tea bag 10 minutes and to drink 3 to 5 cups daily.
I have been sick and am now really trying to rebuild my supply, so my midwife said to steep 3 tea bags at a time which is what I am doing.
Oops forgot to add that when I took it regularly with no supply issues, I noticed an increase within a day. If you are having supply issues, I would wait a couple of days before expecting an increase.
Should not give you abdominal cramps, but that being said, I suppose there is always the chance you are allergic to one of the herbs.....most of them have dandelion, fenugreek, blessed thistle, etc.
It is a galactalogue....won't cause you to start your period. There might be some raspberry leaf in the brand you are using? That might be the "warning" you speak of.....that can be used to induce labor when drunk in larger quantities...I think you are safe having a cup of the mother's milk tea though a few times throughout the day.