The Food and Drug Administration yesterday proposed banning 111 ingredients commonly used in over-the-counter diet drugs, saying they were ineffective and that one of them, guar gum, posed a safety risk.

But the controversial appetite suppressant phenylpropanolamine, known as PPA, will not be included in the ban, to give the FDA more time to review its safety and effectiveness, the agency said in a statement.

Medical experts have linked PPA to dizziness, high blood pressure and other side effects. The product is widely used in diet products.

"The vast majority of them {the 111 ingredients} are just basically totally ineffective for weight loss," said Paul Raford, a physician who was an adviser to a House Energy and Commerce Committee investigation on diet drugs.

The FDA, after receiving 17 consumer complaints that a diet drug containing guar gum caused choking, told the distributor in July to stop selling it. Cal Ban 3000 diet tablets and capsules and similar products were banned from distribution.

The agency also called yesterday for new warning labels on all non-prescription drugs containing water-soluble gums, because of concern that they, too, could cause choking. The label requirements would warn users of diet drugs and laxatives containing such gums to take the products only with a full glass of water and to avoid them altogether if they have ever had difficulty swallowing.

Other ingredients to be banned include alcohol, corn syrup, dextrose, guar gum, kelp, pineapple enyzmes, rice polishings, saccharin, salt, sodium bicarbonate, vitamin C and wheat germ.

There is a 60-day comment period for both FDA proposals. The ban on diet product ingredients would not go into effect until six months after a final rule is issued. The label warning requirement would go into effect earlier.

A number of bulk laxatives such as Fiberall, Metamucil and Serutan, as well as a few antidiarrheal products such as Equalactin and Mitrolan, would be affected by the warning proposal, but could continue to be sold.