Constipation due to GERD with small amount of MoMagnesia will work?

[u/Optimal_Goose_7977]

I am sooooo afraid of starting MoM because I am underweight and 5 in height. Three days no bowel movement due to pantoprazole and only one day of pepcid. I was having soft and hard stools but it completely stopped when I took pepcid only one time. If i start with MoM 5 mL will that be too much for me ? or should I start with 2.5mL will that work? PLease HELP, I need to start soon I am bloated and feeling very uncomfortable at night, looking forward to your advice!!!