Bayer Schering Pharma Bayer Schering Pharma has joined the ranks of firms switching to restrictive distribution arrangements in the UK.

The pharma company, which is the prescription medicines arm of Bayer HealthCare, is following a trend set by GlaxoSmithKline, Pfizer, AstraZeneca and Novartis.

Around 30 of Bayer Schering Pharma's drugs are affected, including erectile dysfunction brand Levitra, antibiotic Ciproxin and blood pressure treatment Adalat.

From July, these and other products will be sold only through wholesalers AAH Pharmaceuticals, Alliance Healthcare (Distribution) – formerly UniChem – and Phoenix Healthcare Distribution.

Williams Medical Supplies will handle Bayer products for non-dispensing doctors.

In a statement the company said: "Bayer is keeping pace with recent market developments by moving to this model. By simplifying our supply chain, we will see improvements in continuity of supply for UK patients."

The selected wholesalers have full UK coverage and will be able to open accounts with new customers, it insisted.

Distribution arrangements of Bayer's consumer care and diabetes care products remains untouched for now. The relevant divisions of the company "have decided not to change their distribution processes at this time", Bayer said.

Wholesalers will be able to purchase product from Bayer until 1 July.