ball python internal parasties

I have question to people who experienced their ball internal parasites.
I know one of the symptom of the internal parasite is eating but not gaining weight or losing weight. My question is, can slow growth also indicate internal parasite? From February until now (6 month exact), my male ball python only gained about 100 g (125 g at first, now 226g). During those time, I had about 13 feedings because I had to switch him from live mouse to f/t rat. Now he is eating f/t rat from June 3rd. Does this slow growth seem fine? considering he has not been constant while trying to switch?

Feeding schedule until now.
3/11 - adult sm mouse
3/15 - adult sm mouse
Switch failed between 3/15 ~ 4/4
4/4- sm mouse
4/9 - sm mouse
4/19 - sm mouse
4/30 - f/t sm smouse
5/5 - f/t lg mouse
Finally switched after one month
6/3 - f/t fuzzy rat
6/17 - f/t fuzzy rat
6/30 - f/t rat pup
7/8 - f/t rat pup
7/15 - rat pup
7/28 - rat pup

It "could" indicate internal parasites...IF the growth is actually "slow". But keep in mind that young snakes seem to take "forever" to grow. There are good
reasons for this: young snakes eat young rodents, which are "lighter" meals (less muscle & bone), & young snakes are growing in length too but it's nearly
imperceptible...so they take a long time to appear bigger in girth. Remember that food supplies their energy for activity as well, it's not only for growth. So-
you need to be patient. ;) And keep in mind that it's healthier for snakes to grow "slow"...don't be tempted to "power feed" so that you see "results more
quickly" as the snake won't be as healthy. If you are still worried about internal parasites, by all means get the stool checked, but most likely all is normal.

So do any of you routinely deworm your snakes yourselves as a preventative measure?

If so:

1. What brand of medication do you use?

2. Do brands of medication differ between species / size of snake?

3. How often do you do this?

4. How do you dose the medication?

5. What are the potential dangers?

6. Is this a good practice and can it be done safely without the assistance of a vet?

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