Moclobemide also interacts with pethidine/meperidine, and dextropropoxyphene. It was made from pethidine (meperidine). It was developed by screening chemicals similar to pethidine (meperidine) for opioid activity. Many were based on fentanyl or meperidine. Picenadol is an effective analgesic with similar efficacy to pethidine (meperidine). It is an analog of pethidine (meperidine) a Schedule II drug. Meprodine is an opioid analgesic that is an analogue of pethidine (meperidine). This is an issue with some well-known drugs such as pethidine (meperidine) and dextropropoxyphene. Another important use of chlormethine is in the synthesis of pethidine (meperidine). PEPAP (phenethylphenylacetoxypiperidine) is an opioid analgesic that is an analog of pethidine (meperidine). However, most opioid tests will not reliably detect oxycodone, oxymorphone, meperidine, or fentanyl. Medications that have been associated include Lithium, sulpiride, and a meperidine analog, 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine. Meperidine is a synthetic opiate part of the arylpiperidine class. These drugs include dextromethorphan (Robitussin), meperidine (Demerol), pentazocine (Talwin), and tramadol (Ultram).