This causes the expansion of the penis. Lifestyle Changes The patient should quit smoking. The rules may be relaxed under certain conditions, including: It is an over-the-counter OTC product that is not for a serious condition, and there is no known significant health risk; or It is a prescription product for a serious condition. And they must be in their original containers. Professional assistance can help patients to manage severe stress. Potential for unsupervised use of the medication Labeling and language issues Lack of information related to side effects Required Documentation Always check with the CBP for updated requirements.Best Pharmacy in Greater Cancun / Riviera Maya. 2 years ago. Save. Any Recommendations on which is the best and largest stocking Pharmacy in the greater . Cancun, Mexico. Level Contributor. 3, posts. 6. Re: Over the Counter Drugs. 12 years ago. Save. In April my DH tried to buy some Amoxicillin to bring back with no luck at . The guide was updated: There are two types of pharmacies in Mexico, the regular Farmacia and the Farmacia Similares. The former sells well-known brand .