Generics contain the same active ingredient as the original brands and usually cost much less. For that reason, many patients now buy generic medicine online, from eye drops such as bimatoprost to weight loss capsules such as orlistat. A little care makes the process safer.
Step one: a valid prescription is required for every order of a prescription medicine. A sensible supplier will always ask to see it. Avoid any website that does not ask for one.
Next, check the details: the active ingredient, the strength and read more the pack size should be clearly listed. Generic tablets may look different from the brand you know, and that is expected.
If you want more detail, this practical guide covers the key checks.
A few examples: glaucoma drops such as bimatoprost or latanoprost are used once a day in the evening, and you should leave five minutes between different drops. Generic orlistat is taken with meals that contain fat and works best with a reduced-fat diet, plus a multivitamin at bedtime.
On delivery, compare the pack with your prescription and keep the leaflet. Tell your doctor which product you are taking.
There is more detail here.
This is general information, not medical advice. Always check with your doctor before starting a new medicine.