www.genomed.com
Although for MS the Genomed study is very limited, however this person has had very positive results. The use of cozaar for tx of kidney disease has been published. Think of aspirin for the use of headaches before they realized all of the other health benefits that it offers.
Cozaar is an angiotensin receptor blocker(ARB) normally used for treating high blood pressure, aka hypertension. But if anyone has their blood pressure lowered too much they will complain that they feel weak, faint, dizzy, passed out, etc. Blood pressure is a balancing act. You have trouble either way, whether it's too high or too low.
I had a patient who forgot to take their medicine for high blood pressure one day. So the next day, he doubled the dose and passed out, most likely because his blood pressure was too low. If your friend taking Cozaar with MS originally had a normal blood pressure, episodes of fealing weak are not surprising, although it could be due to the multiple sclerosis itself.