However, if you experience severe or persistent side effects, such as chest pain, sudden vision changes, or an erection lasting more than four hours, you should seek medical attention immediately. FDA cannot confirm that the manufacturing, quality, storage, and handling of these products follow U. However, if taken as directed by a healthcare provider, it is generally safe to use. To date, FDA is not aware of consumer adverse events related to the use of these counterfeit versions of Cialis. How should I take the C20 pill?Pill with imprint 20 is Yellow, Oval and has been identified as Olanzapine 20 mg. It is supplied by Sun Pharma Global FZE. Olanzapine is used in the treatment of . Pill Identifier Search Imprint C Pill Identifier Search Imprint C Pill Sync ; Identify Pill. Login; Advertise; TOP; Voice Search Barcode Scanner TEAR YELLOW C View . Pill Identifier results for “20 Yellow and Round”. Search by imprint, shape, color or drug name.