Hi
The longer you wait, the worse the stones will get. If you wait until your boy is starting to suddenly lose a lot of weight, then he will struggle a lot more with the recovery than now. If any stones get into the urethra, then you are suddenly dealing with a life or death emergency operation in a much more difficult area if a stone gets stuck in there.
Enrofloxacin is the active ingredient in baytril, which is used as the standard all-purpose antibiotic for guinea pigs. What weight in grams is your piggy and what dosage have you been prescribed?
Please be aware that even the best brands of no added calcium pellets contain more clacium weight by weight than the highest calcium veg, kale. So you
really need to reduce that to 1 tablespoon per piggy per day and you really need to look at your veg diet.
Carrots are like feeding a block of chocolate on a daily basis and lettuce is not exactly extremely high in nutrients. Your current diet is too high in vitamin A, which builds up in the liver if fed too much. But is too low in plant based vitamin C and many other trace elements that are not found in pellets.
Any root veg as a food groups is not good for the oxalates aspect in the formation of bladder stones and should be off the menu for bladder stone piggies.
Please keep in mind that veg and pellets together replace the supplementary role of wild forage, which should make only about a quarter what your piggy eats in a day; the rest should be hay, hay and more hay with some fresh growing dog pee free grass added when it is in season and you can get some pesticide and chemicals free one. The more closer to forage and greener you can aim to keep your veg diet, the better.
We also strongly recommend to filter any water; even if your are not in a hard water area. Minerals and particles in the water can also contribute to the formation of stones.
By overfeeding pellets you also reduce the natural hay intake quite considerably with long term health and life-shortening consequences; hay and fresh grass fibre are what the digestive system is laid out for, as well as the high dental growth rate, especially for the grinding back teeth (the silica in grass fibre is very abrasive) - pellets are too soft as soon as they come into contact with saliva and contain much less fibre and mostly filler products than hay. What most owners also don't know that fresh growing grass is very high in vitamin C and is the reason why your piggies never had the need to make their own in the first place.
In my own long term experience, the diet changes I have made a decade ago have 1-2 years to the average healthy life span of my own piggies and they have also meant that I only have had one bladder stone case (in the wake of some major fresh food supply issues during the first lockdown) in all those years with around 50-60 piggies coming to live here since...
PLEASE take the time to read our diet guide - it is really worth it!
Long Term Balanced General And Special Needs Guinea Pig Diets
PS: I have had a stage of diet experimentation a decade ago when we knew a lot less about guinea pig siet in which I got the balance extactly wrong and ended up with a spate of bladder stones. All my piggies have survived their bladder ops; one even twice. And another one survived needed an emergency spaying operation just 6 months after a removing an 11cm long stone despite being down to just 700g.