The Johnson & Johnson unit whose recall of liquid children’s Tylenol and other pediatric medicines is under Congressional investigation said on Tuesday evening that it was recalling additional over-the-counter drugs.

McNeil Consumer Healthcare, the Johnson & Johnson unit, said that it was recalling four lots of certain Benadryl allergy tablets and one lot of Extra Strength Tylenol gel pills. McNeil did not respond to a reporter’s query about how many bottles those lots amounted to.

The company said in a statement that “the products were inadvertently omitted” from an earlier recall — one preceding the children’s drug recall — involving medicines made at a company plant in Puerto Rico.

Since last November, McNeil has recalled about 11.7 million bottles of various Motrin products and about 6.3 million bottles of Tylenol Arthritis Pain caplets made at that Puerto Rico plant, according to the F.D.A.’s Web site. The company began the recall after receiving consumer complaints about a moldy odor emanating from some products.

The smell was caused by contamination from a chemical byproduct of a substance used to treat wooden transport pallets, the company said. Although risk of serious medical problems was remote, the company said, people should stop using the products.

Refund requests can be made using a company Web site, mcneilproductrecall.com, or toll-free number: 888-222-6036.

McNeil is already under scrutiny by the House Committee on Oversight and Government Reform over a recall in April of an estimated 136 million bottles of liquid pediatric Tylenol, Motrin, Benadryl and Zyrtec.

“Today’s announcement is indication that we have more to look at when it comes to this company,” Representative Edolphus Towns, a New York Democrat who is the chairman of the committee, wrote on Tuesday in an e-mail message in response to a reporter’s query.

• The New York Times