We have a week with no IPOs on the calendar. China Resources Ltd., a SPAC, is listed as pricing during the week of March 31, but was originally supposed to price in February. Because more deals have been pulled than priced this month, let's examine which companies walked away from the public markets — at least for the time being.

MonoSol Rx (www.monosolrx.com, IPO withdrawn March 27)

MonoSol Rx develops thin-film products used for drug delivery. The finished product is similar to the different breath-freshening, cough and cold strips out on the market; in fact, MonoSol makes some of those. Unlike the breath strips, where the taste is the whole point, MonoSol’s film technology encapsulates the drug to mask the taste. This is a huge advantage for foul medications that uncooperative patients have to take by mouth. Two products in development target nausea and Alzheimer’s disease. MonoSol isn’t profitable, though. For the first six months of 2007, it lost $7.6 million on $2.2 million in revenue. The company had planned to offer 4 million shares at a price range of $16 to $18 per share through Cowen & Company.

LifeWatch (www.lifewatchinc.com, IPO withdrawn March 21)

LifeWatch is profitable, but that’s not enough to generate interest these days. The company provides remote cardiac monitoring services. A doctor instructs a patient to wear a monitor to detect cardiac arrhythmias. The data are transmitted via phone to LifeWatch’s call centers, which collect the information to report back to the physician. If a major problem is detected, a LifeWatch rep will call the patient and tell him or her to get medical care. The company is owned by Card Guard AG, a manufacturer of . . .

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