My husband is also on Renvela. He takes 2 with snacks 3 with meals. They work by binding with phosphorus in the stomach I guess so it can be removed and not absorbed by the body, so you should take it 15 min before, during the meal or up to 15 minutes after as Joe mentioned. My husband is also a grazer, especially at night. So sometimes at night he will start snacking on popcorn, swallow a binder, then go back 5 minutes later for a cookie or something and then take another one when he's done eating the 2nd part of his snack because he's supposed to take 2 with snacks. We keep a bottle on the table so it's easy when he finishes dinner he just grabs them. Sometimes at dinner if he goes back for 2nds he will swallow an extra one when he is done just to be safe. His phosphorus was out of control for awhile, but now he's been able to keep it between 5 and 6. I think the way they have to write the script is 3x-4x a day. I know my husbands script is written for like 240 pills per month, they figure 2 meals and 3 snacks for him because hes a grazer. If you're munching a low phosphorus food, you could probably get away with not taking one then, but you should probably clarify with your doc - they probably want you taking 1 any time you eat and just assume that you're eating 3 meals a day and may need to write you a script for more so you can make sure you're taking them when you eat. Also keep an eye on what you drink - the binders apparently do not work with liquids because the phosphorus in the liquids gets absorbed by the stomach too quick.
I recently had a "critical" lab result for phosphorus. My level was 11.4. Up until this, I had been controlling my levels without needing binders. Not sure what happened, but my neph decided to prescribe me Renvela. The directions say to take 1 tablet 3 times a day with meals. My problem is, I am more of a grazer than a 3 normal meal person. If I take 1 pill with my morning protein bar, how long does it work? It is not uncommon for me to snack throughout the day, without having a normal breakfast and lunch. I do eat a regular meal for dinner, but usually have a snack before I go to bed. I have searched the Renvela documents online and can't find any information about how long it works after you take it. Anyone have crazy eating habits like me lol? How do you take your binders? I am going to ask the doc on Tuesday, but sometimes you guys have more experience than the so-called experts! Thanks for any help you may have for me!