Pharmacists are warning that improper storage could make some medications less effective while other drugs could make you more vulnerable to sunburn.

On a beautiful summer day your mind may not be on medication, but an ounce of prevention could save you a lot of grief.

London pharmacist Jim Semchism explains what can happen to gel caps left in extreme heat:

"They disintegrate rather quickly. So if you had them in your purse or your car you'd be looking at a liquid mess in several hours if it was sitting at 90 degrees plus temperatures or in direct sunlight.”

You should be especially careful about sun exposure if you're on medications to treat acne and taking certain other drugs.

"If you're taking something for short-term therapy, like an antihistamine like Benadryl for instance or any antibiotic, you're usually taking the drug for four to six days and it's just not top of mind that this drug makes you more vulnerable."

Improperly storing drugs in the heat and sun could also mean trouble.

Semchism says "In many cases it will destroy it, so that the value of the medication will not be there."

It's important to store your medication at the correct temperature when you're on the road. That means things like avoiding keeping it in a hot car and direct sunlight. The solution could be as simple as keeping a cooler bag on hand.

With blood pressure drugs and diuretics, users are warned to be extra careful about staying hydrated in the hot weather.

Ultimately it's all there in black and white, so be sure to read the labels and ask your pharmacist if you have questions.