Experts say that in at least half of these patients, drugs fail to control seizures.

If the drugs failed to fulfill their initial promise, they were to be removed from the market.

But for an unknown number of other people, the drugs are failing.

The drug also failed a trial of its efficacy.

But the drug failed in early trials, and the company cut costs and staff.

But the drugs have failed for thousands of others, who find the regimens too difficult to take.

If the drugs fail, the woman must have a surgical abortion.

It takes 10 years, and even then, most drugs fail.

When the usual drugs failed, it was time to bring out the big guns.

By not doing so we caused the suffering to continue until the drugs failed, and their hearts stopped.