Picksan is available at your chemist, pharmacy and health food store.
Ingredient: cis- and trans-p-menthane-3,8-diol (3 g/100g), Water, Ethanol, Propylene carbonate, Perfume extracts
Instructions: Carefully spray on all areas of uncovered skin, shoes and items of clothing. Especially spray the lower legs well.
Warning: ticks can also crawl into trouser legs. Repeat this if the effect diminishes (for example due to sweating a lot). Safe use during pregnancy has not been researched.
Don't go to the doctor after every tick bite. This is unnecessary as the tick can often be removed in its entirety.