# Opioids Dosage Conversion — user reviews > 44 indexed App Store user reviews of Opioids Dosage Conversion by Chris Marcellino MD LLC, rated 4.28/5 from 18 ratings. - Source: https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903/reviews - App overview in markdown: https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903.md - Rating breakdown: 5★ 11 · 4★ 3 · 3★ 1 · 2★ 0 · 1★ 2 ## Newest reviews (16 of 44) ### 4/5 — It works *2015-11-29, version 1.8* This app appears to work well. You can choose from 2 different calculation algorithms with lettered abbreviations, but there is no explanation how to choose. prn doses require a frequency input before allowing you to enter the actual number of doses given and this is unnecessary. Looks good though and appears to work. ### 4/5 — Pretty good opioid calculator *2014-10-26, version 1.8* When I upgraded my iPhone to iOS 8, I lost the ability to use my original opioid calculator app, the opioid. This is a fairly suitable replacement, and it works well with good stability on my iPhone 5S running iOS 8. The only suggestion I would have is that it is cumbersome to enter in numerical quantities for milligrams received using "rollers" instead of a keypad. ### 4/5 — Great opioid conversion app *2013-08-20, version 1.2* I'm an anaesthetist (anesthesiologist). This is my favorite opioid conversion app. The only reason I didn't give 5 stars is that there a few opioids and/or routes of delivery that could be added to make it a truly superb app. Well done. ### 5/5 — MD *2013-06-30, version 1.2* Excellent opiod converter. ### 5/5 — Great app *2013-06-29, version 1.2* This is a great app for good equianalgesia calculations - used as a validation of your own calculations helps reduce errors - the "extra" considerations are also very helpful when you are in the fray of someone's pain dilemma - recommend future addition of non-pharmacological and adjuvant Rx 'considerations' ### 5/5 — Love this app! *2013-06-15, version 1.1* This is a great app! ### 5/5 — Retired Traveler *2013-06-07, version 1.1* Having chronic pain and traveling to countries that may not have my U.S. medication, I have found this tool extremely helpful when discussing my dosage with foreign doctors. Simple and easy to use. ### 4/5 — Handy. *2013-05-02, version 1.1* No C/O I find it quick and easy. ### 5/5 — Great dose calculator *2013-02-28, version 1.1* Very quick way to calculate MED ### 4/5 — Great for the wards *2013-02-09, version 1.1* Easy to use, great to use on the wards. ### 4/5 — Easy to use *2013-02-05, version 1.1* Very efficient and intuitive; easy learning curve. Excellent app. ### 4/5 — Too few drugs. But functional *2013-02-03, version 1.1* Better app than most. this app Needs more than just the select few opioids it currently has. Developers, please add these drugs... buprenorphine, meperidine, pentazocine, diacetylmorphine, tramadol. Additional benefit from: References or documents (or links) for current canadian, american, and british therapeutic guidelines for the management of acute, chronic, cancer, bone, and neuropathic pain. Added benefit would be guidelines for CRPS, rheum/osteo Arthritis, shingles and other types of pain. ### 5/5 — Easy and helpful *2013-01-19, version 1.1* Very easy to use and extremely helpful for quick conversions. ### 5/5 — Ok! *2013-01-18, version 1.1* Thank you, Chris. It's really simple and useful. ### 5/5 — Very useful application! *2012-11-04, version 1.1* Easy to use ### 5/5 — Easy to use conversion calculator - based on equianalgesic doses many docs use *2012-09-23, version 1.1* This calculator is easy to use, and references a commonly used equianalgesic dosing table. I recommend checking with your health-system to see whether this is the ratio card your institution uses. *it includes ratio options taught through EPEC - which is what major academic institutions use, including Institute for Palliative Care at San Diego Hospice. I disagree with the previous commentator suggesting it uses dangerous conversions. ## Most critical reviews (10 lowest-rated) ### 1/5 — Needs better interface *2022-07-26, version 2.0* Very cumbersome, and needs better user interface. Needs update. ### 1/5 — Incomplete *2018-11-01, version 1.8* Does not include Tapentadol or many other opioids. Only dosing options are q6h, q8h and w24h. ### 1/5 — Dangerous conversion errors! *2012-03-10, version 1.0.2* This conversion app is REALLY SCARY! I'm not sure where the table/reference is from but highly inaccurate! I truly hope no one is using this though the idea is great and a similar tool used to be on Epocrates. Most pain management prescribers know Morphine is half a potent as Oxycodone, Oxycodone 1/2-2/3 as potent as oxymorphone and it 1/2-2/3 as potent as hydomorphone.. ie morphine 60 mg=hydrocodone 60mg= Oxycodone 30mg=Oxymorphone 20=Hydromorphone 12= Fentanyl patch 25 mcg Patients will suffer and have major complications including death if anyone uses the current app for equal analgesic dosing! Please DON'T! ### 1/5 — Missing some meds... *2010-10-30, version 0* And that's a problem. Period. ### 3/5 — Great App *2013-02-12, version 1.1* Love it. ### 3/5 — An okay app, but serious issues... *2013-01-06, version 1.1* While the app is excellent in assisting pain management providers prescribe opiate medications within a respectable range, I find some major issues: 1. The app does NOT contain the entire gamut of opiates. Although morphine is the absolute gold standard of all decisiveness when trying to prescribe medicine for pain, it leaves two medicines out of any possible equianalgesic dosing - oxymorphone. For people who have this same issue as me, please be aware that oxymorphone is one-half more potent than oxycodone (i.e., 15-20mg oxycodone = 10mg oxymorphone, according to ePocrates) and oxycodone is two-thirds more potent than morphine (i.e., 10mg oxycodone = 15mg morphine, according to that calculation used quite frequently). It also leaves out meperidine/pethidine (even though it's a horrible choice for acute pain management - I, myself, am allergic to it). 2. The app does NOT contain all routes of administration. As some of us have mentioned previously, most opiates that are in the app can be administered in other ways than PO (e.g., oxymorphone IV, methadone IV/IM, meperidine/pethidine IM, as earlier mentioned). 3. The app does NOT contain all dosing schedules. Although there's a way to manipulate the dosing schedules in the app to cater to the dosing schedules some of us prefer to have patients (or if a patient uses this, viz. oncology patients, PCA patients) on, the person using the app shouldn't have to manipulate it to get the right schedule. The specialist/patient using the app should have the right to set the dosing schedule to whatever is appropriate. All in all, it's significantly helpful, but as I mentioned, it needs some serious updates. I suggest my own as listed above, but I know I'm not the only one who has issues with the app. :P Three stars out of five until it's done correctly. ### 3/5 — Good but needs more drugs *2011-12-28, version 1.0.1* There are several drugs not listed that are often used, such as tramadol, dihydrocodiene, pethidine . But otherwise the app is sound. The cross tolerance % is a great addition that is too often forgotten about ### 3/5 — Conversion *2011-11-05, version 1.0.1* The oxycodone to morphine conversion is incorrect. It should be 2:3, not 1:1. ### 3/5 — Prof. of anesthesia and pediatrics *2011-02-08, version 1.0.1* Nice interface design but limited drugs and (worse) limited dozing route (no iv fentanyl choice??) reduce the usefulness of this for inpatients. ### 3/5 — It's ok! *2010-08-05, version 0* This is an app that converts SOME opioid dosages to some others. American based. So of limited use for the UK market. However. It's free. So thanks. Please increase the number of products in updates. ## Most praised reviews (10 highest-rated) ### 5/5 — EBM converter *2025-09-02, version 3.0.2* I use this app daily in my practice and regularly give it to learners. Great app! ### 5/5 — Needs IV option for fentanyl *2023-07-14, version 3.0* Otherwise excellent app! Recommended throughout anesthesia and palliative departments ### 5/5 — You are the best tool I found after looking for so long... Thank you !!! *2015-04-03, version 1.8* Thanks!!!!!! ### 5/5 — Great tool *2014-12-06, version 1.8* Use it all the time. It is quick and efficient! ### 5/5 — Great app!! *2014-10-12, version 1.8* I use it everyday working in pain management! The only improvements you could make is add Nucynta and a two a day dose for Fentanyl Patch!! ### 5/5 — Allows conversion for patients on multiple meds *2014-06-04, version 1.7* Allows for the entry of multiple opioids that can merge into a single conversion recommendation. Well annotated. Other apps I have used required the use of scratch paper to write down intermediate results. Not this one! Thanks for making conversions for my patients faster and safer. ### 5/5 — Helps my practice *2014-01-02, version 1.4* Makes it quicker to switch patients meds, less PDR USEAGE ### 5/5 — Review *2013-11-09, version 1.4* Easy and simple to use. ### 5/5 — MD *2013-09-23, version 1.2* Great App ### 5/5 — Good tool *2013-07-01, version 1.2* Quick and accurate. Use this every day in our busy palliative med consult service. Tracks well with manual conversion charts from other sites. NEVER any problems. Can we see IV fentanyl in the next update please? --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*