Drug traffickers appear to be using US President Donald Trump's image to brand their illegal wares.

Police in Indiana say they've made 129 arrests in a series of drug busts across the state's north and have included a photo of what they say are "Trump-shaped ecstasy pills".

The orange pills are stamped with a face and on the back are the words "great again", an apparent reference to Trump's campaign slogan: 'Make America Great Again'.

Traffickers at times use uniquely shaped and coloured drugs as a marketing technique to encourage buyers to return for more.

Friday's release doesn't provide details, including how many of the pills were seized.

The six-day operation in June involved traffic stops by state and city police, as well as sheriff's departments. LSD, cocaine and other drugs were also seized.