Unless you have professional training , it is folly for a lay person (you) to try a diagnosis based on very limited information and without proper training or even proper diagnosis equipment (medical microscope, dyes, test kits.
The risk is that you misdiagnosed and are giving inappropriate meds and are making any parasitic infection worse.
I question the efficacy of using an antibiotic ONLY to treat / eliminate a parasitic infection .
From the manufacturer's website
ALBON (sulfadimethoxine) is effective for treating a wide range of bacterial infections commonly encountered in dogs and cats. It is indicated for use in dogs and cats with respiratory, genitourinary tract and soft-tissue infections. It is also indicated for treating dogs with bacterial enteritis associated with coccidiosis.
so it is doing nothing to kill off the coccidiosis parasitic infection what so ever. You need another drug to deal with that , and a reptile will have an entirely different response to Albon which is meant for cats and dogs.
Regarding storage of the drug between uses from their Prescribing Information Sheet
https://www.zoetisus.com/products/cats/albon.aspx
STORAGE: Store at controlled room temperature 15°–30°C (59°–86°F).
No mention of deactivation happening if chilled.
Regarding coccidiosis :
There are six species of Eimeria (coccidiosis) which are generally considered to be significant : E. tenella, E. brunetti, E. necatrix, E. maxima, E. mitis and E. acervulina. Each of these species prefers to live in and damage a specific region of the gut. For the purposes of treatment and prevention of coccidiosis it is unimportant to ascertain which species is causing disease
, do you have the knowledge and skill to identify the strain of coccidiosis your dragon is infected by ?
Treatment of coccidiosis generally involves three components.
1.Kill the coccidiosis to stop further gut damage, this requires an
anticoccidial medication. Which one are you using ?
There are two kinds of drugs:
coccidiostats which slow the development of the coccidiosis. This allows the animal to develop immunity to coccidiosis without being overwhelmed. - you are well past this point.
second kind are coccidiocides, one such medication would be Toltrazuril 2.5% w/v (Baycox) which will kill the coccidiosis. - your dragon needs this.
2.control the bacterial disruption to the gut, this is treated by antibiotic therapy. (this is presumeably the job of Albon or other antibiotics (as mentioned by Ellen).)
3.TLC, providing a warm dry environment and following any medication advice. It is advisable at this stage to follow on with provision of multivitamins and a probiotic to restore gut flora with a product such as Beryl’s Friendly Bacteria.
So you need to find a competent vet who knows his stuff and need to take a three pronged strategy :
1) anticoccidial medication
2) antibiotic to treat secondary gut infection
3) regular F10sc sterilization of the dragon's viv and all it's furnature (I'd recommend F10sc used at 1:125 dilution to be sure of killing all coccidial spores.
and unless you do this , your dragon will never be cured.