mutate with ifelse and grepl in R and create new column with matched string

I am trying to create new column with grepl(partial match) and ifelse using mutate. I have list of drug names with unit and I want to create new column with these units. Here is my drug name samples,

 Description
    ZOLEDRONIC ACID INF 4MG/5ML (5ML)
    CALCICHEW D3 FORTE CHEWABLE TABS
    DAYCASE DRUGS
    AKYNZEO (NETUPITANT/PALONOSETRON) HARD CAPS 300MG/0.5MG
    CYCLOPHOSPHAMIDE INF 1MG/ML
    EPIRUBICIN INJ 1MG/ML
    DAYCASE DRUGS
    DAYCASE DRUGS
    ALOXI (PALONOSETRON) INJ 250MCG
    PACLITAXEL INF 1MG/ML
    DEXAMETHASONE VIAL 6.6MG/2ML - USE PSD742
    PACLITAXEL INF 1MG/ML
    RAMUCIRUMAB INF 0.1MG - 100MG

Here is my tried code,

units <- c("TABS","INF","SYR","CAPS","INJ","VIAL","SOL","POWDER","GEL","CREAM","LOTION","AMP"," SINGLEJECT","PFS")

drug_name <- drug_name %>% mutate(unit =  grepl(paste(units,collapse = "|"),Description))

current output is like this,

Description                                 unit
ZOLEDRONIC ACID INF 4MG/5ML (5ML)           TRUE
    CALCICHEW D3 FORTE CHEWABLE TABS        TRUE
    DAYCASE DRUGS                           FALSE
    AKYNZEO (NETUPITANT/PALONOSETRON) CAPS  TRUE
    CYCLOPHOSPHAMIDE INF 1MG/ML             TRUE
    EPIRUBICIN INJ 1MG/ML                   TRUE
    DAYCASE DRUGS                           FALSE
    DAYCASE DRUGS                           FALSE

I dont want unit in TRUE/FALSE, instead it should specify the exact unit, Like this,

        ZOLEDRONIC ACID INF 4MG/5ML (5ML)       INF
        CALCICHEW D3 FORTE CHEWABLE TABS        TABS

I am trying to recode this one but dont know how to do this. Also, I need to extract metrics in drug name (4MG/5ML) into a separate column. I can do this in another query but need to do it single query with unit. Not all the drugs have this format some of them like this--> 01.MG-100MG, 250MCG.

            ZOLEDRONIC ACID INF 4MG/5ML (5ML)       INF    4MG/5ML
            CALCICHEW D3 FORTE CHEWABLE TABS        TABS   NA
            CYCLOPHOSPHAMIDE INF 1MG/ML             INF    1MG/ML
            ALOXI (PALONOSETRON) INJ 250MCG         INF    250MCG

Can anyone help me to solve this?