Dosage for what? Doxycycline ? 100mg once a day for six weeks while taking the Albendazole and/or Ivermectin.
The purpose of the Doxycycline or Augmentin is to clear up the dead parasites rotting inside your body caused by taking the Albendazole or Ivermectin.
You can buy Doxycycline online if you google Fish Doxycycline or Fish Bactrim. I dont know if you can get Augmentin which is a stronger better version of Bactrim.
I doubt a doc will give you six weeks worth of either but you can try.